Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "55 patches.

  Subsystems affected by this patch series: percpu, procfs, sysctl,
  misc, core-kernel, get_maintainer, lib, checkpatch, binfmt, nilfs2,
  hfs, fat, adfs, panic, delayacct, kconfig, kcov, and ubsan"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (55 commits)
  lib: remove redundant assignment to variable ret
  ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
  kcov: fix generic Kconfig dependencies if ARCH_WANTS_NO_INSTR
  lib/Kconfig.debug: make TEST_KMOD depend on PAGE_SIZE_LESS_THAN_256KB
  btrfs: use generic Kconfig option for 256kB page size limit
  arch/Kconfig: split PAGE_SIZE_LESS_THAN_256KB from PAGE_SIZE_LESS_THAN_64KB
  configs: introduce debug.config for CI-like setup
  delayacct: track delays from memory compact
  Documentation/accounting/delay-accounting.rst: add thrashing page cache and direct compact
  delayacct: cleanup flags in struct task_delay_info and functions use it
  delayacct: fix incomplete disable operation when switch enable to disable
  delayacct: support swapin delay accounting for swapping without blkio
  panic: remove oops_id
  panic: use error_report_end tracepoint on warnings
  fs/adfs: remove unneeded variable make code cleaner
  FAT: use io_schedule_timeout() instead of congestion_wait()
  hfsplus: use struct_group_attr() for memcpy() region
  nilfs2: remove redundant pointer sbufs
  fs/binfmt_elf: use PT_LOAD p_align values for static PIE
  const_structs.checkpatch: add frequently used ops structs
  ...

77 files changed, 826 insertions, 873 deletions

diff --git a/Documentation/accounting/delay-accounting.rst b/Documentation/accounting/delay-accounting.rst
index 1b8b46deeb29..197fe319cbec 100644
--- a/Documentation/accounting/delay-accounting.rst
+++ b/Documentation/accounting/delay-accounting.rst
@@ -13,6 +13,8 @@ a) waiting for a CPU (while being runnable)
 b) completion of synchronous block I/O initiated by the task
 c) swapping in pages
 d) memory reclaim
+e) thrashing page cache
+f) direct compact
 
 and makes these statistics available to userspace through
 the taskstats interface.
@@ -41,11 +43,12 @@ generic data structure to userspace corresponding to per-pid and per-tgid
 statistics. The delay accounting functionality populates specific fields of
 this structure. See
 
-     include/linux/taskstats.h
+     include/uapi/linux/taskstats.h
 
 for a description of the fields pertaining to delay accounting.
 It will generally be in the form of counters returning the cumulative
-delay seen for cpu, sync block I/O, swapin, memory reclaim etc.
+delay seen for cpu, sync block I/O, swapin, memory reclaim, thrash page
+cache, direct compact etc.
 
 Taking the difference of two successive readings of a given
 counter (say cpu_delay_total) for a task will give the delay
@@ -88,41 +91,37 @@ seen.
 
 General format of the getdelays command::
 
-	getdelays [-t tgid] [-p pid] [-c cmd...]
-
+	getdelays [-dilv] [-t tgid] [-p pid]
 
 Get delays, since system boot, for pid 10::
 
-	# ./getdelays -p 10
+	# ./getdelays -d -p 10
 	(output similar to next case)
 
 Get sum of delays, since system boot, for all pids with tgid 5::
 
-	# ./getdelays -t 5
-
-
-	CPU	count	real total	virtual total	delay total
-		7876	92005750	100000000	24001500
-	IO	count	delay total
-		0	0
-	SWAP	count	delay total
-		0	0
-	RECLAIM	count	delay total
-		0	0
+	# ./getdelays -d -t 5
+	print delayacct stats ON
+	TGID	5
 
-Get delays seen in executing a given simple command::
 
-  # ./getdelays -c ls /
+	CPU             count     real total  virtual total    delay total  delay average
+	                    8        7000000        6872122        3382277          0.423ms
+	IO              count    delay total  delay average
+		            0              0              0ms
+	SWAP            count    delay total  delay average
+	                    0              0              0ms
+	RECLAIM         count    delay total  delay average
+		            0              0              0ms
+	THRASHING       count    delay total  delay average
+	                    0              0              0ms
+	COMPACT         count    delay total  delay average
+	                    0              0              0ms
 
-  bin   data1  data3  data5  dev  home  media  opt   root  srv        sys  usr
-  boot  data2  data4  data6  etc  lib   mnt    proc  sbin  subdomain  tmp  var
+Get IO accounting for pid 1, it works only with -p::
 
+	# ./getdelays -i -p 1
+	printing IO accounting
+	linuxrc: read=65536, write=0, cancelled_write=0
 
-  CPU	count	real total	virtual total	delay total
-	6	4000250		4000000		0
-  IO	count	delay total
-	0	0
-  SWAP	count	delay total
-	0	0
-  RECLAIM	count	delay total
-	0	0
+The above command can be used with -v to get more debug information.
diff --git a/arch/Kconfig b/arch/Kconfig
index 874c65d9e963..678a80713b21 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -997,6 +997,10 @@ config PAGE_SIZE_LESS_THAN_64KB
 	depends on !PAGE_SIZE_64KB
 	depends on !PARISC_PAGE_SIZE_64KB
 	depends on !PPC_64K_PAGES
+	depends on PAGE_SIZE_LESS_THAN_256KB
+
+config PAGE_SIZE_LESS_THAN_256KB
+	def_bool y
 	depends on !PPC_256K_PAGES
 	depends on !PAGE_SIZE_256KB
 
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f6e333b59314..dc10d26cb432 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1136,6 +1136,10 @@ config NUMA
 	select GENERIC_ARCH_NUMA
 	select ACPI_NUMA if ACPI
 	select OF_NUMA
+	select HAVE_SETUP_PER_CPU_AREA
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
+	select NEED_PER_CPU_PAGE_FIRST_CHUNK
+	select USE_PERCPU_NUMA_NODE_ID
 	help
 	  Enable NUMA (Non-Uniform Memory Access) support.
 
@@ -1152,22 +1156,6 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
-config USE_PERCPU_NUMA_NODE_ID
-	def_bool y
-	depends on NUMA
-
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool y
-	depends on NUMA
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y
-	depends on NUMA
-
-config NEED_PER_CPU_PAGE_FIRST_CHUNK
-	def_bool y
-	depends on NUMA
-
 source "kernel/Kconfig.hz"
 
 config ARCH_SPARSEMEM_ENABLE
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 1e33666fa679..703952819e10 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -32,6 +32,7 @@ config IA64
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_DYNAMIC_FTRACE if (!ITANIUM)
 	select HAVE_FUNCTION_TRACER
+	select HAVE_SETUP_PER_CPU_AREA
 	select TTY
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_VIRT_CPU_ACCOUNTING
@@ -88,9 +89,6 @@ config GENERIC_CALIBRATE_DELAY
 	bool
 	default y
 
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool y
-
 config DMI
 	bool
 	default y
@@ -292,6 +290,7 @@ config NUMA
 	bool "NUMA support"
 	depends on !FLATMEM
 	select SMP
+	select USE_PERCPU_NUMA_NODE_ID
 	help
 	  Say Y to compile the kernel to support NUMA (Non-Uniform Memory
 	  Access).  This option is for configuring high-end multiprocessor
@@ -311,10 +310,6 @@ config HAVE_ARCH_NODEDATA_EXTENSION
 	def_bool y
 	depends on NUMA
 
-config USE_PERCPU_NUMA_NODE_ID
-	def_bool y
-	depends on NUMA
-
 config HAVE_MEMORYLESS_NODES
 	def_bool NUMA
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 3dd8c4618293..edf6c1577449 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2674,6 +2674,8 @@ config NUMA
 	bool "NUMA Support"
 	depends on SYS_SUPPORTS_NUMA
 	select SMP
+	select HAVE_SETUP_PER_CPU_AREA
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
 	help
 	  Say Y to compile the kernel to support NUMA (Non-Uniform Memory
 	  Access).  This option improves performance on systems with more
@@ -2684,14 +2686,6 @@ config NUMA
 config SYS_SUPPORTS_NUMA
 	bool
 
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool y
-	depends on NUMA
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y
-	depends on NUMA
-
 config RELOCATABLE
 	bool "Relocatable kernel"
 	depends on SYS_SUPPORTS_RELOCATABLE
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 325e1552cbea..5a8002839550 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -519,17 +519,9 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 	return node_distance(cpu_to_node(from), cpu_to_node(to));
 }
 
-static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
-				       size_t align)
+static int __init pcpu_cpu_to_node(int cpu)
 {
-	return memblock_alloc_try_nid(size, align, __pa(MAX_DMA_ADDRESS),
-				      MEMBLOCK_ALLOC_ACCESSIBLE,
-				      cpu_to_node(cpu));
-}
-
-static void __init pcpu_fc_free(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
+	return cpu_to_node(cpu);
 }
 
 void __init setup_per_cpu_areas(void)
@@ -545,7 +537,7 @@ void __init setup_per_cpu_areas(void)
 	rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 				    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
 				    pcpu_cpu_distance,
-				    pcpu_fc_alloc, pcpu_fc_free);
+				    pcpu_cpu_to_node);
 	if (rc < 0)
 		panic("Failed to initialize percpu areas.");
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0631c9241af3..b779603978e1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -55,15 +55,6 @@ config ARCH_MMAP_RND_COMPAT_BITS_MIN
 	default 9 if PPC_16K_PAGES	#  9 = 23 (8MB) - 14 (16K)
 	default 11			# 11 = 23 (8MB) - 12 (4K)
 
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool PPC64
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y if PPC64
-
-config NEED_PER_CPU_PAGE_FIRST_CHUNK
-	def_bool y if PPC64
-
 config NR_IRQS
 	int "Number of virtual interrupt numbers"
 	range 32 1048576
@@ -241,6 +232,7 @@ config PPC
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RELIABLE_STACKTRACE
 	select HAVE_RSEQ
+	select HAVE_SETUP_PER_CPU_AREA		if PPC64
 	select HAVE_SOFTIRQ_ON_OWN_STACK
 	select HAVE_STACKPROTECTOR		if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
 	select HAVE_STACKPROTECTOR		if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
@@ -255,6 +247,8 @@ config PPC
 	select MMU_GATHER_RCU_TABLE_FREE
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE		if PPC64 || NOT_COHERENT_CACHE
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK	if PPC64
+	select NEED_PER_CPU_PAGE_FIRST_CHUNK	if PPC64
 	select NEED_SG_DMA_LENGTH
 	select OF
 	select OF_DMA_DEFAULT_COHERENT		if !NOT_COHERENT_CACHE
@@ -660,6 +654,7 @@ config NUMA
 	bool "NUMA Memory Allocation and Scheduler Support"
 	depends on PPC64 && SMP
 	default y if PPC_PSERIES || PPC_POWERNV
+	select USE_PERCPU_NUMA_NODE_ID
 	help
 	  Enable NUMA (Non-Uniform Memory Access) support.
 
@@ -673,10 +668,6 @@ config NODES_SHIFT
 	default "4"
 	depends on NUMA
 
-config USE_PERCPU_NUMA_NODE_ID
-	def_bool y
-	depends on NUMA
-
 config HAVE_MEMORYLESS_NODES
 	def_bool y
 	depends on NUMA
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index d87f7c1103ce..be8577ac9397 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -771,50 +771,6 @@ void __init emergency_stack_init(void)
 }
 
 #ifdef CONFIG_SMP
-/**
- * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
- * @cpu: cpu to allocate for
- * @size: size allocation in bytes
- * @align: alignment
- *
- * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
- * does the right thing for NUMA regardless of the current
- * configuration.
- *
- * RETURNS:
- * Pointer to the allocated area on success, NULL on failure.
- */
-static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
-					size_t align)
-{
-	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
-#ifdef CONFIG_NUMA
-	int node = early_cpu_to_node(cpu);
-	void *ptr;
-
-	if (!node_online(node) || !NODE_DATA(node)) {
-		ptr = memblock_alloc_from(size, align, goal);
-		pr_info("cpu %d has no node %d or node-local memory\n",
-			cpu, node);
-		pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
-			 cpu, size, __pa(ptr));
-	} else {
-		ptr = memblock_alloc_try_nid(size, align, goal,
-					     MEMBLOCK_ALLOC_ACCESSIBLE, node);
-		pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
-			 "%016lx\n", cpu, size, node, __pa(ptr));
-	}
-	return ptr;
-#else
-	return memblock_alloc_from(size, align, goal);
-#endif
-}
-
-static void __init pcpu_free_bootmem(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
-}
-
 static int pcpu_cpu_distance(unsigned int from, unsigned int to)
 {
 	if (early_cpu_to_node(from) == early_cpu_to_node(to))
@@ -823,53 +779,13 @@ static int pcpu_cpu_distance(unsigned int from, unsigned int to)
 		return REMOTE_DISTANCE;
 }
 
-unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
-EXPORT_SYMBOL(__per_cpu_offset);
-
-static void __init pcpu_populate_pte(unsigned long addr)
+static __init int pcpu_cpu_to_node(int cpu)
 {
-	pgd_t *pgd = pgd_offset_k(addr);
-	p4d_t *p4d;
-	pud_t *pud;
-	pmd_t *pmd;
-
-	p4d = p4d_offset(pgd, addr);
-	if (p4d_none(*p4d)) {
-		pud_t *new;
-
-		new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
-		if (!new)
-			goto err_alloc;
-		p4d_populate(&init_mm, p4d, new);
-	}
-
-	pud = pud_offset(p4d, addr);
-	if (pud_none(*pud)) {
-		pmd_t *new;
-
-		new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pud_populate(&init_mm, pud, new);
-	}
-
-	pmd = pmd_offset(pud, addr);
-	if (!pmd_present(*pmd)) {
-		pte_t *new;
-
-		new = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pmd_populate_kernel(&init_mm, pmd, new);
-	}
-
-	return;
-
-err_alloc:
-	panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
-	      __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+	return early_cpu_to_node(cpu);
 }
 
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(__per_cpu_offset);
 
 void __init setup_per_cpu_areas(void)
 {
@@ -900,7 +816,7 @@ void __init setup_per_cpu_areas(void)
 
 	if (pcpu_chosen_fc != PCPU_FC_PAGE) {
 		rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
-					    pcpu_alloc_bootmem, pcpu_free_bootmem);
+					    pcpu_cpu_to_node);
 		if (rc)
 			pr_warn("PERCPU: %s allocator failed (%d), "
 				"falling back to page size\n",
@@ -908,8 +824,7 @@ void __init setup_per_cpu_areas(void)
 	}
 
 	if (rc < 0)
-		rc = pcpu_page_first_chunk(0, pcpu_alloc_bootmem, pcpu_free_bootmem,
-					   pcpu_populate_pte);
+		rc = pcpu_page_first_chunk(0, pcpu_cpu_to_node);
 	if (rc < 0)
 		panic("cannot initialize percpu area (err=%d)", rc);
 
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 4602cfe92a20..171ecc6d1792 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -335,6 +335,8 @@ config NUMA
 	select GENERIC_ARCH_NUMA
 	select OF_NUMA
 	select ARCH_SUPPORTS_NUMA_BALANCING
+	select USE_PERCPU_NUMA_NODE_ID
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
 	help
 	  Enable NUMA (Non-Uniform Memory Access) support.
 
@@ -350,14 +352,6 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
-config USE_PERCPU_NUMA_NODE_ID
-	def_bool y
-	depends on NUMA
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y
-	depends on NUMA
-
 config RISCV_ISA_C
 	bool "Emit compressed instructions when building Linux"
 	default y
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 66fc08646be5..1cab1b284f1a 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -97,6 +97,9 @@ config SPARC64
 	select PCI_DOMAINS if PCI
 	select ARCH_HAS_GIGANTIC_PAGE
 	select HAVE_SOFTIRQ_ON_OWN_STACK
+	select HAVE_SETUP_PER_CPU_AREA
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
+	select NEED_PER_CPU_PAGE_FIRST_CHUNK
 
 config ARCH_PROC_KCORE_TEXT
 	def_bool y
@@ -123,15 +126,6 @@ config AUDIT_ARCH
 	bool
 	default y
 
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool y if SPARC64
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y if SPARC64
-
-config NEED_PER_CPU_PAGE_FIRST_CHUNK
-	def_bool y if SPARC64
-
 config MMU
 	bool
 	default y
diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c
index 3a66e62eb2a0..ab657b359789 100644
--- a/arch/sparc/kernel/led.c
+++ b/arch/sparc/kernel/led.c
@@ -114,18 +114,16 @@ static const struct proc_ops led_proc_ops = {
 };
 #endif
 
-static struct proc_dir_entry *led;
-
 #define LED_VERSION	"0.1"
 
 static int __init led_init(void)
 {
 	timer_setup(&led_blink_timer, led_blink, 0);
 
-	led = proc_create("led", 0, NULL, &led_proc_ops);
-	if (!led)
+#ifdef CONFIG_PROC_FS
+	if (!proc_create("led", 0, NULL, &led_proc_ops))
 		return -ENOMEM;
-
+#endif
 	printk(KERN_INFO
 	       "led: version %s, Lars Kotthoff <metalhead@metalhead.ws>\n",
 	       LED_VERSION);
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index b98a7bbe6728..a1f78e9ddaf3 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1526,50 +1526,6 @@ void smp_send_stop(void)
 		smp_call_function(stop_this_cpu, NULL, 0);
 }
 
-/**
- * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
- * @cpu: cpu to allocate for
- * @size: size allocation in bytes
- * @align: alignment
- *
- * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
- * does the right thing for NUMA regardless of the current
- * configuration.
- *
- * RETURNS:
- * Pointer to the allocated area on success, NULL on failure.
- */
-static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
-					size_t align)
-{
-	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
-#ifdef CONFIG_NUMA
-	int node = cpu_to_node(cpu);
-	void *ptr;
-
-	if (!node_online(node) || !NODE_DATA(node)) {
-		ptr = memblock_alloc_from(size, align, goal);
-		pr_info("cpu %d has no node %d or node-local memory\n",
-			cpu, node);
-		pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
-			 cpu, size, __pa(ptr));
-	} else {
-		ptr = memblock_alloc_try_nid(size, align, goal,
-					     MEMBLOCK_ALLOC_ACCESSIBLE, node);
-		pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
-			 "%016lx\n", cpu, size, node, __pa(ptr));
-	}
-	return ptr;
-#else
-	return memblock_alloc_from(size, align, goal);
-#endif
-}
-
-static void __init pcpu_free_bootmem(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
-}
-
 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 {
 	if (cpu_to_node(from) == cpu_to_node(to))
@@ -1578,57 +1534,9 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 		return REMOTE_DISTANCE;
 }
 
-static void __init pcpu_populate_pte(unsigned long addr)
+static int __init pcpu_cpu_to_node(int cpu)
 {
-	pgd_t *pgd = pgd_offset_k(addr);
-	p4d_t *p4d;
-	pud_t *pud;
-	pmd_t *pmd;
-
-	if (pgd_none(*pgd)) {
-		pud_t *new;
-
-		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pgd_populate(&init_mm, pgd, new);
-	}
-
-	p4d = p4d_offset(pgd, addr);
-	if (p4d_none(*p4d)) {
-		pud_t *new;
-
-		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		p4d_populate(&init_mm, p4d, new);
-	}
-
-	pud = pud_offset(p4d, addr);
-	if (pud_none(*pud)) {
-		pmd_t *new;
-
-		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pud_populate(&init_mm, pud, new);
-	}
-
-	pmd = pmd_offset(pud, addr);
-	if (!pmd_present(*pmd)) {
-		pte_t *new;
-
-		new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pmd_populate_kernel(&init_mm, pmd, new);
-	}
-
-	return;
-
-err_alloc:
-	panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
-	      __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+	return cpu_to_node(cpu);
 }
 
 void __init setup_per_cpu_areas(void)
@@ -1641,8 +1549,7 @@ void __init setup_per_cpu_areas(void)
 		rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 					    PERCPU_DYNAMIC_RESERVE, 4 << 20,
 					    pcpu_cpu_distance,
-					    pcpu_alloc_bootmem,
-					    pcpu_free_bootmem);
+					    pcpu_cpu_to_node);
 		if (rc)
 			pr_warn("PERCPU: %s allocator failed (%d), "
 				"falling back to page size\n",
@@ -1650,9 +1557,7 @@ void __init setup_per_cpu_areas(void)
 	}
 	if (rc < 0)
 		rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
-					   pcpu_alloc_bootmem,
-					   pcpu_free_bootmem,
-					   pcpu_populate_pte);
+					   pcpu_cpu_to_node);
 	if (rc < 0)
 		panic("cannot initialize percpu area (err=%d)", rc);
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 407533c835fe..6fddb63271d9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -78,7 +78,7 @@ config X86
 	select ARCH_HAS_FILTER_PGPROT
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
-	select ARCH_HAS_KCOV			if X86_64 && STACK_VALIDATION
+	select ARCH_HAS_KCOV			if X86_64
 	select ARCH_HAS_MEM_ENCRYPT
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
@@ -240,6 +240,7 @@ config X86
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RELIABLE_STACKTRACE		if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
 	select HAVE_FUNCTION_ARG_ACCESS_API
+	select HAVE_SETUP_PER_CPU_AREA
 	select HAVE_SOFTIRQ_ON_OWN_STACK
 	select HAVE_STACKPROTECTOR		if CC_HAS_SANE_STACKPROTECTOR
 	select HAVE_STACK_VALIDATION		if X86_64
@@ -253,6 +254,8 @@ config X86
 	select HAVE_GENERIC_VDSO
 	select HOTPLUG_SMT			if SMP
 	select IRQ_FORCED_THREADING
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
+	select NEED_PER_CPU_PAGE_FIRST_CHUNK
 	select NEED_SG_DMA_LENGTH
 	select PCI_DOMAINS			if PCI
 	select PCI_LOCKLESS_CONFIG		if PCI
@@ -333,15 +336,6 @@ config ARCH_HAS_CPU_RELAX
 config ARCH_HAS_FILTER_PGPROT
 	def_bool y
 
-config HAVE_SETUP_PER_CPU_AREA
-	def_bool y
-
-config NEED_PER_CPU_EMBED_FIRST_CHUNK
-	def_bool y
-
-config NEED_PER_CPU_PAGE_FIRST_CHUNK
-	def_bool y
-
 config ARCH_HIBERNATION_POSSIBLE
 	def_bool y
 
@@ -1575,6 +1569,7 @@ config NUMA
 	depends on SMP
 	depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
 	default y if X86_BIGSMP
+	select USE_PERCPU_NUMA_NODE_ID
 	help
 	  Enable NUMA (Non-Uniform Memory Access) support.
 
@@ -2450,10 +2445,6 @@ config ARCH_HAS_ADD_PAGES
 config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
 	def_bool y
 
-config USE_PERCPU_NUMA_NODE_ID
-	def_bool y
-	depends on NUMA
-
 menu "Power management and ACPI options"
 
 config ARCH_HIBERNATION_HEADER
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 7b65275544b2..49325caa7307 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -84,60 +84,6 @@ static bool __init pcpu_need_numa(void)
 }
 #endif
 
-/**
- * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
- * @cpu: cpu to allocate for
- * @size: size allocation in bytes
- * @align: alignment
- *
- * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
- * does the right thing for NUMA regardless of the current
- * configuration.
- *
- * RETURNS:
- * Pointer to the allocated area on success, NULL on failure.
- */
-static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
-					unsigned long align)
-{
-	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
-#ifdef CONFIG_NUMA
-	int node = early_cpu_to_node(cpu);
-	void *ptr;
-
-	if (!node_online(node) || !NODE_DATA(node)) {
-		ptr = memblock_alloc_from(size, align, goal);
-		pr_info("cpu %d has no node %d or node-local memory\n",
-			cpu, node);
-		pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
-			 cpu, size, __pa(ptr));
-	} else {
-		ptr = memblock_alloc_try_nid(size, align, goal,
-					     MEMBLOCK_ALLOC_ACCESSIBLE,
-					     node);
-
-		pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n",
-			 cpu, size, node, __pa(ptr));
-	}
-	return ptr;
-#else
-	return memblock_alloc_from(size, align, goal);
-#endif
-}
-
-/*
- * Helpers for first chunk memory allocation
- */
-static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
-{
-	return pcpu_alloc_bootmem(cpu, size, align);
-}
-
-static void __init pcpu_fc_free(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
-}
-
 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 {
 #ifdef CONFIG_NUMA
@@ -150,7 +96,12 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 #endif
 }
 
-static void __init pcpup_populate_pte(unsigned long addr)
+static int __init pcpu_cpu_to_node(int cpu)
+{
+	return early_cpu_to_node(cpu);
+}
+
+void __init pcpu_populate_pte(unsigned long addr)
 {
 	populate_extra_pte(addr);
 }
@@ -205,15 +156,14 @@ void __init setup_per_cpu_areas(void)
 		rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
 					    dyn_size, atom_size,
 					    pcpu_cpu_distance,
-					    pcpu_fc_alloc, pcpu_fc_free);
+					    pcpu_cpu_to_node);
 		if (rc < 0)
 			pr_warn("%s allocator failed (%d), falling back to page size\n",
 				pcpu_fc_names[pcpu_chosen_fc], rc);
 	}
 	if (rc < 0)
 		rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
-					   pcpu_fc_alloc, pcpu_fc_free,
-					   pcpup_populate_pte);
+					   pcpu_cpu_to_node);
 	if (rc < 0)
 		panic("cannot initialize percpu area (err=%d)", rc);
 
diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
index bc1876915457..eaa31e567d1e 100644
--- a/drivers/base/arch_numa.c
+++ b/drivers/base/arch_numa.c
@@ -14,7 +14,6 @@
 #include <linux/of.h>
 
 #include <asm/sections.h>
-#include <asm/pgalloc.h>
 
 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
 EXPORT_SYMBOL(node_data);
@@ -155,66 +154,6 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 	return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
 }
 
-static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
-				       size_t align)
-{
-	int nid = early_cpu_to_node(cpu);
-
-	return  memblock_alloc_try_nid(size, align,
-			__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
-}
-
-static void __init pcpu_fc_free(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
-}
-
-#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
-static void __init pcpu_populate_pte(unsigned long addr)
-{
-	pgd_t *pgd = pgd_offset_k(addr);
-	p4d_t *p4d;
-	pud_t *pud;
-	pmd_t *pmd;
-
-	p4d = p4d_offset(pgd, addr);
-	if (p4d_none(*p4d)) {
-		pud_t *new;
-
-		new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		p4d_populate(&init_mm, p4d, new);
-	}
-
-	pud = pud_offset(p4d, addr);
-	if (pud_none(*pud)) {
-		pmd_t *new;
-
-		new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pud_populate(&init_mm, pud, new);
-	}
-
-	pmd = pmd_offset(pud, addr);
-	if (!pmd_present(*pmd)) {
-		pte_t *new;
-
-		new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
-		if (!new)
-			goto err_alloc;
-		pmd_populate_kernel(&init_mm, pmd, new);
-	}
-
-	return;
-
-err_alloc:
-	panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
-	      __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
-}
-#endif
-
 void __init setup_per_cpu_areas(void)
 {
 	unsigned long delta;
@@ -229,7 +168,7 @@ void __init setup_per_cpu_areas(void)
 		rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 					    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
 					    pcpu_cpu_distance,
-					    pcpu_fc_alloc, pcpu_fc_free);
+					    early_cpu_to_node);
 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 		if (rc < 0)
 			pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n",
@@ -239,10 +178,7 @@ void __init setup_per_cpu_areas(void)
 
 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 	if (rc < 0)
-		rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
-					   pcpu_fc_alloc,
-					   pcpu_fc_free,
-					   pcpu_populate_pte);
+		rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node);
 #endif
 	if (rc < 0)
 		panic("Failed to initialize percpu areas (err=%d).", rc);
diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index 9363bccfc6e7..a8e1c30c370f 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -196,7 +196,7 @@ struct qib_ctxtdata {
 	pid_t pid;
 	pid_t subpid[QLOGIC_IB_MAX_SUBCTXT];
 	/* same size as task_struct .comm[], command that opened context */
-	char comm[16];
+	char comm[TASK_COMM_LEN];
 	/* pkeys set by this use of this ctxt */
 	u16 pkeys[4];
 	/* so file ops can get at unit */
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index 63854f4b6524..aa290928cf96 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1321,7 +1321,7 @@ static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
 	rcd->tid_pg_list = ptmp;
 	rcd->pid = current->pid;
 	init_waitqueue_head(&dd->rcd[ctxt]->wait);
-	strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
+	get_task_comm(rcd->comm, current);
 	ctxt_fp(fp) = rcd;
 	qib_stats.sps_ctxts++;
 	dd->freectxts--;
diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c
index afe11f475b8c..5018b9387694 100644
--- a/drivers/infiniband/sw/rxe/rxe_qp.c
+++ b/drivers/infiniband/sw/rxe/rxe_qp.c
@@ -217,8 +217,7 @@ static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 	 * the port number must be in the Dynamic Ports range
 	 * (0xc000 - 0xffff).
 	 */
-	qp->src_port = RXE_ROCE_V2_SPORT +
-		(hash_32_generic(qp_num(qp), 14) & 0x3fff);
+	qp->src_port = RXE_ROCE_V2_SPORT + (hash_32(qp_num(qp), 14) & 0x3fff);
 	qp->sq.max_wr		= init->cap.max_send_wr;
 
 	/* These caps are limited by rxe_qp_chk_cap() done by the caller */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.c
index 2f3c451148db..2f8908074303 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.c
@@ -4,6 +4,8 @@
  */
 
 #include <asm/unaligned.h>
+
+#include <linux/math.h>
 #include <linux/string.h>
 #include <linux/bug.h>
 
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index adbb3a1edcbf..5156821bfe6a 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -355,7 +355,6 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
 {
 	struct super_block *sb = inode->i_sb;
 	struct object_info obj;
-	int ret;
 
 	obj.indaddr	= ADFS_I(inode)->indaddr;
 	obj.name_len	= 0;
@@ -365,6 +364,5 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
 	obj.attr	= ADFS_I(inode)->attr;
 	obj.size	= inode->i_size;
 
-	ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
-	return ret;
+	return adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
 }
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index f8c7f26f1fbb..605017eb9349 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1116,11 +1116,11 @@ out_free_interp:
 			 * independently randomized mmap region (0 load_bias
 			 * without MAP_FIXED nor MAP_FIXED_NOREPLACE).
 			 */
-			if (interpreter) {
+			alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
+			if (alignment > ELF_MIN_ALIGN) {
 				load_bias = ELF_ET_DYN_BASE;
 				if (current->flags & PF_RANDOMIZE)
 					load_bias += arch_mmap_rnd();
-				alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum);
 				if (alignment)
 					load_bias &= ~(alignment - 1);
 				elf_flags |= MAP_FIXED_NOREPLACE;
@@ -1585,7 +1585,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
 	SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
 	SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
 	rcu_read_unlock();
-	strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
+	get_task_comm(psinfo->pr_fname, p);
 
 	return 0;
 }
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 520a0f6a7d9e..183e5c4aed34 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -18,8 +18,7 @@ config BTRFS_FS
 	select RAID6_PQ
 	select XOR_BLOCKS
 	select SRCU
-	depends on !PPC_256K_PAGES	# powerpc
-	depends on !PAGE_SIZE_256KB	# hexagon
+	depends on PAGE_SIZE_LESS_THAN_256KB
 
 	help
 	  Btrfs is a general purpose copy-on-write filesystem with extents,
diff --git a/fs/exec.c b/fs/exec.c
index 82db656ca709..3c3c366a9bcf 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1207,7 +1207,8 @@ static int unshare_sighand(struct task_struct *me)
 char *__get_task_comm(char *buf, size_t buf_size, struct task_struct *tsk)
 {
 	task_lock(tsk);
-	strncpy(buf, tsk->comm, buf_size);
+	/* Always NUL terminated and zero-padded */
+	strscpy_pad(buf, tsk->comm, buf_size);
 	task_unlock(tsk);
 	return buf;
 }
@@ -1222,7 +1223,7 @@ void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec)
 {
 	task_lock(tsk);
 	trace_task_rename(tsk, buf);
-	strlcpy(tsk->comm, buf, sizeof(tsk->comm));
+	strscpy_pad(tsk->comm, buf, sizeof(tsk->comm));
 	task_unlock(tsk);
 	perf_event_comm(tsk, exec);
 }
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 13855ba49cd9..a5a309fcc7fa 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -175,9 +175,10 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 static int fat_file_release(struct inode *inode, struct file *filp)
 {
 	if ((filp->f_mode & FMODE_WRITE) &&
-	     MSDOS_SB(inode->i_sb)->options.flush) {
+	    MSDOS_SB(inode->i_sb)->options.flush) {
 		fat_flush_inodes(inode->i_sb, inode, NULL);
-		congestion_wait(BLK_RW_ASYNC, HZ/10);
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		io_schedule_timeout(HZ/10);
 	}
 	return 0;
 }
diff --git a/fs/hfsplus/hfsplus_raw.h b/fs/hfsplus/hfsplus_raw.h
index 456e87aec7fd..68b4240c6191 100644
--- a/fs/hfsplus/hfsplus_raw.h
+++ b/fs/hfsplus/hfsplus_raw.h
@@ -260,8 +260,10 @@ struct hfsplus_cat_folder {
 	__be32 access_date;
 	__be32 backup_date;
 	struct hfsplus_perm permissions;
-	struct DInfo user_info;
-	struct DXInfo finder_info;
+	struct_group_attr(info, __packed,
+		struct DInfo user_info;
+		struct DXInfo finder_info;
+	);
 	__be32 text_encoding;
 	__be32 subfolders;	/* Subfolder count in HFSX. Reserved in HFS+. */
 } __packed;
@@ -294,8 +296,10 @@ struct hfsplus_cat_file {
 	__be32 access_date;
 	__be32 backup_date;
 	struct hfsplus_perm permissions;
-	struct FInfo user_info;
-	struct FXInfo finder_info;
+	struct_group_attr(info, __packed,
+		struct FInfo user_info;
+		struct FXInfo finder_info;
+	);
 	__be32 text_encoding;
 	u32 reserved2;
 
diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index e2855ceefd39..49891b12c415 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -296,7 +296,7 @@ int __hfsplus_setxattr(struct inode *inode, const char *name,
 					sizeof(hfsplus_cat_entry));
 		if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
 			if (size == folder_finderinfo_len) {
-				memcpy(&entry.folder.user_info, value,
+				memcpy(&entry.folder.info, value,
 						folder_finderinfo_len);
 				hfs_bnode_write(cat_fd.bnode, &entry,
 					cat_fd.entryoffset,
@@ -309,7 +309,7 @@ int __hfsplus_setxattr(struct inode *inode, const char *name,
 			}
 		} else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
 			if (size == file_finderinfo_len) {
-				memcpy(&entry.file.user_info, value,
+				memcpy(&entry.file.info, value,
 						file_finderinfo_len);
 				hfs_bnode_write(cat_fd.bnode, &entry,
 					cat_fd.entryoffset,
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index bc3e2cd4117f..063dd16d75b5 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -195,12 +195,12 @@ void nilfs_page_bug(struct page *page)
  */
 static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
 {
-	struct buffer_head *dbh, *dbufs, *sbh, *sbufs;
+	struct buffer_head *dbh, *dbufs, *sbh;
 	unsigned long mask = NILFS_BUFFER_INHERENT_BITS;
 
 	BUG_ON(PageWriteback(dst));
 
-	sbh = sbufs = page_buffers(src);
+	sbh = page_buffers(src);
 	if (!page_has_buffers(dst))
 		create_empty_buffers(dst, sbh->b_size, 0);
 
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 43a7abde9e42..fd8b0c12b2cb 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -92,6 +92,7 @@
 #include <linux/string_helpers.h>
 #include <linux/user_namespace.h>
 #include <linux/fs_struct.h>
+#include <linux/kthread.h>
 
 #include <asm/processor.h>
 #include "internal.h"
@@ -102,6 +103,8 @@ void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
 
 	if (p->flags & PF_WQ_WORKER)
 		wq_worker_comm(tcomm, sizeof(tcomm), p);
+	else if (p->flags & PF_KTHREAD)
+		get_kthread_comm(tcomm, sizeof(tcomm), p);
 	else
 		__get_task_comm(tcomm, sizeof(tcomm), p);
 
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 13eda8de2998..d654ce7150fd 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -670,10 +670,10 @@ static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
 /************************************************************************/
 
 /* permission checks */
-static int proc_fd_access_allowed(struct inode *inode)
+static bool proc_fd_access_allowed(struct inode *inode)
 {
 	struct task_struct *task;
-	int allowed = 0;
+	bool allowed = false;
 	/* Allow access to a task's file descriptors if it is us or we
 	 * may use ptrace attach to the process and find out that
 	 * information.
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 5d66faecd4ef..389e1e42e7d9 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -163,7 +163,7 @@ static int insert_entry(struct ctl_table_header *head, struct ctl_table *entry)
 		else {
 			pr_err("sysctl duplicate entry: ");
 			sysctl_print_dir(head->parent);
-			pr_cont("/%s\n", entry->procname);
+			pr_cont("%s\n", entry->procname);
 			return -EEXIST;
 		}
 	}
@@ -1020,8 +1020,8 @@ failed:
 	if (IS_ERR(subdir)) {
 		pr_err("sysctl could not get directory: ");
 		sysctl_print_dir(dir);
-		pr_cont("/%*.*s %ld\n",
-			namelen, namelen, name, PTR_ERR(subdir));
+		pr_cont("%*.*s %ld\n", namelen, namelen, name,
+			PTR_ERR(subdir));
 	}
 	drop_sysctl_table(&dir->header);
 	if (new)
@@ -1053,7 +1053,6 @@ static int sysctl_follow_link(struct ctl_table_header **phead,
 	struct ctl_dir *dir;
 	int ret;
 
-	ret = 0;
 	spin_lock(&sysctl_lock);
 	root = (*pentry)->data;
 	set = lookup_header_set(root);
@@ -1626,7 +1625,7 @@ static void put_links(struct ctl_table_header *header)
 		else {
 			pr_err("sysctl link missing during unregister: ");
 			sysctl_print_dir(parent);
-			pr_cont("/%s\n", name);
+			pr_cont("%s\n", name);
 		}
 	}
 }
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 509f85148fee..702754dd1daf 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -65,8 +65,6 @@ static size_t vmcoredd_orig_sz;
 static DECLARE_RWSEM(vmcore_cb_rwsem);
 /* List of registered vmcore callbacks. */
 static LIST_HEAD(vmcore_cb_list);
-/* Whether we had a surprise unregistration of a callback. */
-static bool vmcore_cb_unstable;
 /* Whether the vmcore has been opened once. */
 static bool vmcore_opened;
 
@@ -94,10 +92,8 @@ void unregister_vmcore_cb(struct vmcore_cb *cb)
 	 * very unusual (e.g., forced driver removal), but we cannot stop
 	 * unregistering.
 	 */
-	if (vmcore_opened) {
+	if (vmcore_opened)
 		pr_warn_once("Unexpected vmcore callback unregistration\n");
-		vmcore_cb_unstable = true;
-	}
 	up_write(&vmcore_cb_rwsem);
 }
 EXPORT_SYMBOL_GPL(unregister_vmcore_cb);
@@ -108,8 +104,6 @@ static bool pfn_is_ram(unsigned long pfn)
 	bool ret = true;
 
 	lockdep_assert_held_read(&vmcore_cb_rwsem);
-	if (unlikely(vmcore_cb_unstable))
-		return false;
 
 	list_for_each_entry(cb, &vmcore_cb_list, next) {
 		if (unlikely(!cb->pfn_is_ram))
@@ -581,7 +575,7 @@ static int vmcore_remap_oldmem_pfn(struct vm_area_struct *vma,
 	 * looping over all pages without a reason.
 	 */
 	down_read(&vmcore_cb_rwsem);
-	if (!list_empty(&vmcore_cb_list) || vmcore_cb_unstable)
+	if (!list_empty(&vmcore_cb_list))
 		ret = remap_oldmem_pfn_checked(vma, from, pfn, size, prot);
 	else
 		ret = remap_oldmem_pfn_range(vma, from, pfn, size, prot);
diff --git a/include/kunit/assert.h b/include/kunit/assert.h
index ad889b539ab3..ccbc36c0b02f 100644
--- a/include/kunit/assert.h
+++ b/include/kunit/assert.h
@@ -10,7 +10,7 @@
 #define _KUNIT_ASSERT_H
 
 #include <linux/err.h>
-#include <linux/kernel.h>
+#include <linux/printk.h>
 
 struct kunit;
 struct string_stream;
diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h
index af7e6eb50283..3e03d010bd2e 100644
--- a/include/linux/delayacct.h
+++ b/include/linux/delayacct.h
@@ -9,18 +9,9 @@
 
 #include <uapi/linux/taskstats.h>
 
-/*
- * Per-task flags relevant to delay accounting
- * maintained privately to avoid exhausting similar flags in sched.h:PF_*
- * Used to set current->delays->flags
- */
-#define DELAYACCT_PF_SWAPIN	0x00000001	/* I am doing a swapin */
-#define DELAYACCT_PF_BLKIO	0x00000002	/* I am waiting on IO */
-
 #ifdef CONFIG_TASK_DELAY_ACCT
 struct task_delay_info {
 	raw_spinlock_t	lock;
-	unsigned int	flags;	/* Private per-task flags */
 
 	/* For each stat XXX, add following, aligned appropriately
 	 *
@@ -37,13 +28,13 @@ struct task_delay_info {
 	 * associated with the operation is added to XXX_delay.
 	 * XXX_delay contains the accumulated delay time in nanoseconds.
 	 */
-	u64 blkio_start;	/* Shared by blkio, swapin */
+	u64 blkio_start;
 	u64 blkio_delay;	/* wait for sync block io completion */
-	u64 swapin_delay;	/* wait for swapin block io completion */
+	u64 swapin_start;
+	u64 swapin_delay;	/* wait for swapin */
 	u32 blkio_count;	/* total count of the number of sync block */
 				/* io operations performed */
-	u32 swapin_count;	/* total count of the number of swapin block */
-				/* io operations performed */
+	u32 swapin_count;	/* total count of swapin */
 
 	u64 freepages_start;
 	u64 freepages_delay;	/* wait for memory reclaim */
@@ -51,8 +42,12 @@ struct task_delay_info {
 	u64 thrashing_start;
 	u64 thrashing_delay;	/* wait for thrashing page */
 
+	u64 compact_start;
+	u64 compact_delay;	/* wait for memory compact */
+
 	u32 freepages_count;	/* total count of memory reclaim */
 	u32 thrashing_count;	/* total count of thrash waits */
+	u32 compact_count;	/* total count of memory compact */
 };
 #endif
 
@@ -79,26 +74,10 @@ extern void __delayacct_freepages_start(void);
 extern void __delayacct_freepages_end(void);
 extern void __delayacct_thrashing_start(void);
 extern void __delayacct_thrashing_end(void);
-
-static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
-{
-	if (p->delays)
-		return (p->delays->flags & DELAYACCT_PF_BLKIO);
-	else
-		return 0;
-}
-
-static inline void delayacct_set_flag(struct task_struct *p, int flag)
-{
-	if (p->delays)
-		p->delays->flags |= flag;
-}
-
-static inline void delayacct_clear_flag(struct task_struct *p, int flag)
-{
-	if (p->delays)
-		p->delays->flags &= ~flag;
-}
+extern void __delayacct_swapin_start(void);
+extern void __delayacct_swapin_end(void);
+extern void __delayacct_compact_start(void);
+extern void __delayacct_compact_end(void);
 
 static inline void delayacct_tsk_init(struct task_struct *tsk)
 {
@@ -123,7 +102,6 @@ static inline void delayacct_blkio_start(void)
 	if (!static_branch_unlikely(&delayacct_key))
 		return;
 
-	delayacct_set_flag(current, DELAYACCT_PF_BLKIO);
 	if (current->delays)
 		__delayacct_blkio_start();
 }
@@ -135,7 +113,6 @@ static inline void delayacct_blkio_end(struct task_struct *p)
 
 	if (p->delays)
 		__delayacct_blkio_end(p);
-	delayacct_clear_flag(p, DELAYACCT_PF_BLKIO);
 }
 
 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
@@ -147,33 +124,77 @@ static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
 
 static inline void delayacct_freepages_start(void)
 {
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
 	if (current->delays)
 		__delayacct_freepages_start();
 }
 
 static inline void delayacct_freepages_end(void)
 {
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
 	if (current->delays)
 		__delayacct_freepages_end();
 }
 
 static inline void delayacct_thrashing_start(void)
 {
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
 	if (current->delays)
 		__delayacct_thrashing_start();
 }
 
 static inline void delayacct_thrashing_end(void)
 {
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
 	if (current->delays)
 		__delayacct_thrashing_end();
 }
 
+static inline void delayacct_swapin_start(void)
+{
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
+	if (current->delays)
+		__delayacct_swapin_start();
+}
+
+static inline void delayacct_swapin_end(void)
+{
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
+	if (current->delays)
+		__delayacct_swapin_end();
+}
+
+static inline void delayacct_compact_start(void)
+{
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
+	if (current->delays)
+		__delayacct_compact_start();
+}
+
+static inline void delayacct_compact_end(void)
+{
+	if (!static_branch_unlikely(&delayacct_key))
+		return;
+
+	if (current->delays)
+		__delayacct_compact_end();
+}
+
 #else
-static inline void delayacct_set_flag(struct task_struct *p, int flag)
-{}
-static inline void delayacct_clear_flag(struct task_struct *p, int flag)
-{}
 static inline void delayacct_init(void)
 {}
 static inline void delayacct_tsk_init(struct task_struct *tsk)
@@ -199,6 +220,14 @@ static inline void delayacct_thrashing_start(void)
 {}
 static inline void delayacct_thrashing_end(void)
 {}
+static inline void delayacct_swapin_start(void)
+{}
+static inline void delayacct_swapin_end(void)
+{}
+static inline void delayacct_compact_start(void)
+{}
+static inline void delayacct_compact_end(void)
+{}
 
 #endif /* CONFIG_TASK_DELAY_ACCT */
 
diff --git a/include/linux/elfcore-compat.h b/include/linux/elfcore-compat.h
index e272c3d452ce..54feb64e9b5d 100644
--- a/include/linux/elfcore-compat.h
+++ b/include/linux/elfcore-compat.h
@@ -43,6 +43,11 @@ struct compat_elf_prpsinfo
 	__compat_uid_t			pr_uid;
 	__compat_gid_t			pr_gid;
 	compat_pid_t			pr_pid, pr_ppid, pr_pgrp, pr_sid;
+	/*
+	 * The hard-coded 16 is derived from TASK_COMM_LEN, but it can't be
+	 * changed as it is exposed to userspace. We'd better make it hard-coded
+	 * here.
+	 */
 	char				pr_fname[16];
 	char				pr_psargs[ELF_PRARGSZ];
 };
diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index 957ebec35aad..746e081879a5 100644
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -65,6 +65,11 @@ struct elf_prpsinfo
 	__kernel_gid_t	pr_gid;
 	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
 	/* Lots missing */
+	/*
+	 * The hard-coded 16 is derived from TASK_COMM_LEN, but it can't be
+	 * changed as it is exposed to userspace. We'd better make it hard-coded
+	 * here.
+	 */
 	char	pr_fname[16];	/* filename of executable */
 	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
 };
diff --git a/include/linux/hash.h b/include/linux/hash.h
index ad6fa21d977b..38edaa08f862 100644
--- a/include/linux/hash.h
+++ b/include/linux/hash.h
@@ -62,10 +62,7 @@ static inline u32 __hash_32_generic(u32 val)
 	return val * GOLDEN_RATIO_32;
 }
 
-#ifndef HAVE_ARCH_HASH_32
-#define hash_32 hash_32_generic
-#endif
-static inline u32 hash_32_generic(u32 val, unsigned int bits)
+static inline u32 hash_32(u32 val, unsigned int bits)
 {
 	/* High bits are more random, so use them. */
 	return __hash_32(val) >> (32 - bits);
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 055eb203c00e..33f47a996513 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -1,4 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NOTE:
+ *
+ * This header has combined a lot of unrelated to each other stuff.
+ * The process of splitting its content is in progress while keeping
+ * backward compatibility. That's why it's highly recommended NOT to
+ * include this header inside another header file, especially under
+ * generic or architectural include/ directory.
+ */
 #ifndef _LINUX_KERNEL_H
 #define _LINUX_KERNEL_H
 
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index b6c8aafa8db5..3df4ea04716f 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -33,6 +33,7 @@ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
 					  unsigned int cpu,
 					  const char *namefmt);
 
+void get_kthread_comm(char *buf, size_t buf_size, struct task_struct *tsk);
 bool set_kthread_struct(struct task_struct *p);
 
 void kthread_set_per_cpu(struct task_struct *k, int cpu);
diff --git a/include/linux/list.h b/include/linux/list.h
index 6636fc07f918..dd6c2041d09c 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -258,8 +258,7 @@ static inline void list_bulk_move_tail(struct list_head *head,
  * @list: the entry to test
  * @head: the head of the list
  */
-static inline int list_is_first(const struct list_head *list,
-					const struct list_head *head)
+static inline int list_is_first(const struct list_head *list, const struct list_head *head)
 {
 	return list->prev == head;
 }
@@ -269,13 +268,22 @@ static inline int list_is_first(const struct list_head *list,
  * @list: the entry to test
  * @head: the head of the list
  */
-static inline int list_is_last(const struct list_head *list,
-				const struct list_head *head)
+static inline int list_is_last(const struct list_head *list, const struct list_head *head)
 {
 	return list->next == head;
 }
 
 /**
+ * list_is_head - tests whether @list is the list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_head(const struct list_head *list, const struct list_head *head)
+{
+	return list == head;
+}
+
+/**
  * list_empty - tests whether a list is empty
  * @head: the list to test.
  */
@@ -318,7 +326,7 @@ static inline void list_del_init_careful(struct list_head *entry)
 static inline int list_empty_careful(const struct list_head *head)
 {
 	struct list_head *next = smp_load_acquire(&head->next);
-	return (next == head) && (next == head->prev);
+	return list_is_head(next, head) && (next == head->prev);
 }
 
 /**
@@ -393,10 +401,9 @@ static inline void list_cut_position(struct list_head *list,
 {
 	if (list_empty(head))
 		return;
-	if (list_is_singular(head) &&
-		(head->next != entry && head != entry))
+	if (list_is_singular(head) && !list_is_head(entry, head) && (entry != head->next))
 		return;
-	if (entry == head)
+	if (list_is_head(entry, head))
 		INIT_LIST_HEAD(list);
 	else
 		__list_cut_position(list, head, entry);
@@ -570,7 +577,7 @@ static inline void list_splice_tail_init(struct list_head *list,
  * @head:	the head for your list.
  */
 #define list_for_each(pos, head) \
-	for (pos = (head)->next; pos != (head); pos = pos->next)
+	for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next)
 
 /**
  * list_for_each_continue - continue iteration over a list
@@ -580,7 +587,7 @@ static inline void list_splice_tail_init(struct list_head *list,
  * Continue to iterate over a list, continuing after the current position.
  */
 #define list_for_each_continue(pos, head) \
-	for (pos = pos->next; pos != (head); pos = pos->next)
+	for (pos = pos->next; !list_is_head(pos, (head)); pos = pos->next)
 
 /**
  * list_for_each_prev	-	iterate over a list backwards
@@ -588,7 +595,7 @@ static inline void list_splice_tail_init(struct list_head *list,
  * @head:	the head for your list.
  */
 #define list_for_each_prev(pos, head) \
-	for (pos = (head)->prev; pos != (head); pos = pos->prev)
+	for (pos = (head)->prev; !list_is_head(pos, (head)); pos = pos->prev)
 
 /**
  * list_for_each_safe - iterate over a list safe against removal of list entry
@@ -597,8 +604,9 @@ static inline void list_splice_tail_init(struct list_head *list,
  * @head:	the head for your list.
  */
 #define list_for_each_safe(pos, n, head) \
-	for (pos = (head)->next, n = pos->next; pos != (head); \
-		pos = n, n = pos->next)
+	for (pos = (head)->next, n = pos->next; \
+	     !list_is_head(pos, (head)); \
+	     pos = n, n = pos->next)
 
 /**
  * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
@@ -608,7 +616,7 @@ static inline void list_splice_tail_init(struct list_head *list,
  */
 #define list_for_each_prev_safe(pos, n, head) \
 	for (pos = (head)->prev, n = pos->prev; \
-	     pos != (head); \
+	     !list_is_head(pos, (head)); \
 	     pos = n, n = pos->prev)
 
 /**
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index ae4004e7957e..f1ec5ad1351c 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -94,10 +94,7 @@ extern const char * const pcpu_fc_names[PCPU_FC_NR];
 
 extern enum pcpu_fc pcpu_chosen_fc;
 
-typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
-				     size_t align);
-typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
-typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
+typedef int (pcpu_fc_cpu_to_node_fn_t)(int cpu);
 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 
 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
@@ -111,15 +108,13 @@ extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 				size_t atom_size,
 				pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
-				pcpu_fc_alloc_fn_t alloc_fn,
-				pcpu_fc_free_fn_t free_fn);
+				pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);
 #endif
 
 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
+void __init pcpu_populate_pte(unsigned long addr);
 extern int __init pcpu_page_first_chunk(size_t reserved_size,
-				pcpu_fc_alloc_fn_t alloc_fn,
-				pcpu_fc_free_fn_t free_fn,
-				pcpu_fc_populate_pte_fn_t populate_pte_fn);
+				pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);
 #endif
 
 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align) __alloc_size(1);
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 069c7fd95396..01b9268451a8 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -178,8 +178,16 @@ static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 #define proc_create_seq(name, mode, parent, ops) ({NULL;})
 #define proc_create_single(name, mode, parent, show) ({NULL;})
 #define proc_create_single_data(name, mode, parent, show, data) ({NULL;})
-#define proc_create(name, mode, parent, proc_ops) ({NULL;})
-#define proc_create_data(name, mode, parent, proc_ops, data) ({NULL;})
+
+static inline struct proc_dir_entry *
+proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent,
+	    const struct proc_ops *proc_ops)
+{ return NULL; }
+
+static inline struct proc_dir_entry *
+proc_create_data(const char *name, umode_t mode, struct proc_dir_entry *parent,
+		 const struct proc_ops *proc_ops, void *data)
+{ return NULL; }
 
 static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
 static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a6a2db5f85ac..508b91d57470 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -274,8 +274,13 @@ struct task_group;
 
 #define get_current_state()	READ_ONCE(current->__state)
 
-/* Task command name length: */
-#define TASK_COMM_LEN			16
+/*
+ * Define the task command name length as enum, then it can be visible to
+ * BPF programs.
+ */
+enum {
+	TASK_COMM_LEN = 16,
+};
 
 extern void scheduler_tick(void);
 
diff --git a/include/linux/unaligned/packed_struct.h b/include/linux/unaligned/packed_struct.h
index c0d817de4df2..f4c8eaf4d012 100644
--- a/include/linux/unaligned/packed_struct.h
+++ b/include/linux/unaligned/packed_struct.h
@@ -1,7 +1,7 @@
 #ifndef _LINUX_UNALIGNED_PACKED_STRUCT_H
 #define _LINUX_UNALIGNED_PACKED_STRUCT_H
 
-#include <linux/kernel.h>
+#include <linux/types.h>
 
 struct __una_u16 { u16 x; } __packed;
 struct __una_u32 { u32 x; } __packed;
diff --git a/include/trace/events/error_report.h b/include/trace/events/error_report.h
index 96f64bf218b2..a1922a800e6f 100644
--- a/include/trace/events/error_report.h
+++ b/include/trace/events/error_report.h
@@ -17,14 +17,16 @@
 
 enum error_detector {
 	ERROR_DETECTOR_KFENCE,
-	ERROR_DETECTOR_KASAN
+	ERROR_DETECTOR_KASAN,
+	ERROR_DETECTOR_WARN,
 };
 
 #endif /* __ERROR_REPORT_DECLARE_TRACE_ENUMS_ONCE_ONLY */
 
-#define error_detector_list	\
+#define error_detector_list			\
 	EM(ERROR_DETECTOR_KFENCE, "kfence")	\
-	EMe(ERROR_DETECTOR_KASAN, "kasan")
+	EM(ERROR_DETECTOR_KASAN, "kasan")	\
+	EMe(ERROR_DETECTOR_WARN, "warning")
 /* Always end the list with an EMe. */
 
 #undef EM
diff --git a/include/uapi/linux/taskstats.h b/include/uapi/linux/taskstats.h
index ccbd08709321..12327d32378f 100644
--- a/include/uapi/linux/taskstats.h
+++ b/include/uapi/linux/taskstats.h
@@ -34,7 +34,7 @@
  */
 
 
-#define TASKSTATS_VERSION	10
+#define TASKSTATS_VERSION	11
 #define TS_COMM_LEN		32	/* should be >= TASK_COMM_LEN
 					 * in linux/sched.h */
 
@@ -172,6 +172,10 @@ struct taskstats {
 
 	/* v10: 64-bit btime to avoid overflow */
 	__u64	ac_btime64;		/* 64-bit begin time */
+
+	/* Delay waiting for memory compact */
+	__u64	compact_count;
+	__u64	compact_delay_total;
 };
 
 
diff --git a/include/uapi/linux/uuid.h b/include/uapi/linux/uuid.h
index e5a7eecef7c3..c0f4bd9b040e 100644
--- a/include/uapi/linux/uuid.h
+++ b/include/uapi/linux/uuid.h
@@ -1,18 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* DO NOT USE in new code! This is solely for MEI due to legacy reasons */
 /*
  * UUID/GUID definition
  *
  * Copyright (C) 2010, Intel Corp.
  *	Huang Ying <ying.huang@intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation;
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #ifndef _UAPI_LINUX_UUID_H_
diff --git a/kernel/configs/debug.config b/kernel/configs/debug.config
new file mode 100644
index 000000000000..e9ffb0cc1eec
--- /dev/null
+++ b/kernel/configs/debug.config
@@ -0,0 +1,105 @@
+# The config is based on running daily CI for enterprise Linux distros to
+# seek regressions on linux-next builds on different bare-metal and virtual
+# platforms. It can be used for example,
+#
+# $ make ARCH=arm64 defconfig debug.config
+#
+# Keep alphabetically sorted inside each section.
+#
+# printk and dmesg options
+#
+CONFIG_DEBUG_BUGVERBOSE=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_PRINTK_CALLER=y
+CONFIG_PRINTK_TIME=y
+CONFIG_SYMBOLIC_ERRNAME=y
+#
+# Compile-time checks and compiler options
+#
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_SECTION_MISMATCH=y
+CONFIG_FRAME_WARN=2048
+CONFIG_SECTION_MISMATCH_WARN_ONLY=y
+#
+# Generic Kernel Debugging Instruments
+#
+# CONFIG_UBSAN_ALIGNMENT is not set
+# CONFIG_UBSAN_DIV_ZERO is not set
+# CONFIG_UBSAN_TRAP is not set
+# CONFIG_WARN_ALL_UNSEEDED_RANDOM is not set
+CONFIG_DEBUG_FS=y
+CONFIG_DEBUG_FS_ALLOW_ALL=y
+CONFIG_DEBUG_IRQFLAGS=y
+CONFIG_UBSAN=y
+CONFIG_UBSAN_BOOL=y
+CONFIG_UBSAN_BOUNDS=y
+CONFIG_UBSAN_ENUM=y
+CONFIG_UBSAN_SHIFT=y
+CONFIG_UBSAN_UNREACHABLE=y
+#
+# Memory Debugging
+#
+# CONFIG_DEBUG_PAGEALLOC is not set
+# CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is not set
+# CONFIG_DEBUG_RODATA_TEST is not set
+# CONFIG_DEBUG_WX is not set
+# CONFIG_KFENCE is not set
+# CONFIG_PAGE_POISONING is not set
+# CONFIG_SLUB_STATS is not set
+CONFIG_PAGE_EXTENSION=y
+CONFIG_PAGE_OWNER=y
+CONFIG_DEBUG_KMEMLEAK=y
+CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y
+CONFIG_DEBUG_OBJECTS=y
+CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1
+CONFIG_DEBUG_OBJECTS_FREE=y
+CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
+CONFIG_DEBUG_OBJECTS_TIMERS=y
+CONFIG_DEBUG_OBJECTS_WORK=y
+CONFIG_DEBUG_PER_CPU_MAPS=y
+CONFIG_DEBUG_STACK_USAGE=y
+CONFIG_DEBUG_VIRTUAL=y
+CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_VM_PGFLAGS=y
+CONFIG_DEBUG_VM_RB=y
+CONFIG_DEBUG_VM_VMACACHE=y
+CONFIG_GENERIC_PTDUMP=y
+CONFIG_KASAN=y
+CONFIG_KASAN_GENERIC=y
+CONFIG_KASAN_INLINE=y
+CONFIG_KASAN_VMALLOC=y
+CONFIG_PTDUMP_DEBUGFS=y
+CONFIG_SCHED_STACK_END_CHECK=y
+CONFIG_SLUB_DEBUG_ON=y
+#
+# Debug Oops, Lockups and Hangs
+#
+# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
+# CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC is not set
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_DETECT_HUNG_TASK=y
+CONFIG_PANIC_ON_OOPS=y
+CONFIG_PANIC_TIMEOUT=0
+CONFIG_SOFTLOCKUP_DETECTOR=y
+#
+# Lock Debugging (spinlocks, mutexes, etc...)
+#
+# CONFIG_PROVE_RAW_LOCK_NESTING is not set
+CONFIG_PROVE_LOCKING=y
+#
+# Debug kernel data structures
+#
+CONFIG_BUG_ON_DATA_CORRUPTION=y
+#
+# RCU Debugging
+#
+CONFIG_PROVE_RCU=y
+CONFIG_PROVE_RCU_LIST=y
+#
+# Tracers
+#
+CONFIG_BRANCH_PROFILE_NONE=y
+CONFIG_DYNAMIC_FTRACE=y
+CONFIG_FTRACE=y
+CONFIG_FUNCTION_TRACER=y
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 51530d5b15a8..c5e8cea9e05f 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -100,19 +100,10 @@ void __delayacct_blkio_start(void)
  */
 void __delayacct_blkio_end(struct task_struct *p)
 {
-	struct task_delay_info *delays = p->delays;
-	u64 *total;
-	u32 *count;
-
-	if (p->delays->flags & DELAYACCT_PF_SWAPIN) {
-		total = &delays->swapin_delay;
-		count = &delays->swapin_count;
-	} else {
-		total = &delays->blkio_delay;
-		count = &delays->blkio_count;
-	}
-
-	delayacct_end(&delays->lock, &delays->blkio_start, total, count);
+	delayacct_end(&p->delays->lock,
+		      &p->delays->blkio_start,
+		      &p->delays->blkio_delay,
+		      &p->delays->blkio_count);
 }
 
 int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
@@ -164,10 +155,13 @@ int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 	d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
 	tmp = d->thrashing_delay_total + tsk->delays->thrashing_delay;
 	d->thrashing_delay_total = (tmp < d->thrashing_delay_total) ? 0 : tmp;
+	tmp = d->compact_delay_total + tsk->delays->compact_delay;
+	d->compact_delay_total = (tmp < d->compact_delay_total) ? 0 : tmp;
 	d->blkio_count += tsk->delays->blkio_count;
 	d->swapin_count += tsk->delays->swapin_count;
 	d->freepages_count += tsk->delays->freepages_count;
 	d->thrashing_count += tsk->delays->thrashing_count;
+	d->compact_count += tsk->delays->compact_count;
 	raw_spin_unlock_irqrestore(&tsk->delays->lock, flags);
 
 	return 0;
@@ -179,8 +173,7 @@ __u64 __delayacct_blkio_ticks(struct task_struct *tsk)
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&tsk->delays->lock, flags);
-	ret = nsec_to_clock_t(tsk->delays->blkio_delay +
-				tsk->delays->swapin_delay);
+	ret = nsec_to_clock_t(tsk->delays->blkio_delay);
 	raw_spin_unlock_irqrestore(&tsk->delays->lock, flags);
 	return ret;
 }
@@ -210,3 +203,29 @@ void __delayacct_thrashing_end(void)
 		      &current->delays->thrashing_delay,
 		      &current->delays->thrashing_count);
 }
+
+void __delayacct_swapin_start(void)
+{
+	current->delays->swapin_start = local_clock();
+}
+
+void __delayacct_swapin_end(void)
+{
+	delayacct_end(&current->delays->lock,
+		      &current->delays->swapin_start,
+		      &current->delays->swapin_delay,
+		      &current->delays->swapin_count);
+}
+
+void __delayacct_compact_start(void)
+{
+	current->delays->compact_start = local_clock();
+}
+
+void __delayacct_compact_end(void)
+{
+	delayacct_end(&current->delays->lock,
+		      &current->delays->compact_start,
+		      &current->delays->compact_delay,
+		      &current->delays->compact_count);
+}
diff --git a/kernel/kthread.c b/kernel/kthread.c
index a2c156ee8275..38c6dd822da8 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -61,6 +61,8 @@ struct kthread {
 #ifdef CONFIG_BLK_CGROUP
 	struct cgroup_subsys_state *blkcg_css;
 #endif
+	/* To store the full name if task comm is truncated. */
+	char *full_name;
 };
 
 enum KTHREAD_BITS {
@@ -94,6 +96,18 @@ static inline struct kthread *__to_kthread(struct task_struct *p)
 	return kthread;
 }
 
+void get_kthread_comm(char *buf, size_t buf_size, struct task_struct *tsk)
+{
+	struct kthread *kthread = to_kthread(tsk);
+
+	if (!kthread || !kthread->full_name) {
+		__get_task_comm(buf, buf_size, tsk);
+		return;
+	}
+
+	strscpy_pad(buf, kthread->full_name, buf_size);
+}
+
 bool set_kthread_struct(struct task_struct *p)
 {
 	struct kthread *kthread;
@@ -121,10 +135,14 @@ void free_kthread_struct(struct task_struct *k)
 	 * Can be NULL if kmalloc() in set_kthread_struct() failed.
 	 */
 	kthread = to_kthread(k);
+	if (!kthread)
+		return;
+
 #ifdef CONFIG_BLK_CGROUP
-	WARN_ON_ONCE(kthread && kthread->blkcg_css);
+	WARN_ON_ONCE(kthread->blkcg_css);
 #endif
 	k->worker_private = NULL;
+	kfree(kthread->full_name);
 	kfree(kthread);
 }
 
@@ -438,12 +456,22 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data),
 	task = create->result;
 	if (!IS_ERR(task)) {
 		char name[TASK_COMM_LEN];
+		va_list aq;
+		int len;
 
 		/*
 		 * task is already visible to other tasks, so updating
 		 * COMM must be protected.
 		 */
-		vsnprintf(name, sizeof(name), namefmt, args);
+		va_copy(aq, args);
+		len = vsnprintf(name, sizeof(name), namefmt, aq);
+		va_end(aq);
+		if (len >= TASK_COMM_LEN) {
+			struct kthread *kthread = to_kthread(task);
+
+			/* leave it truncated when out of memory. */
+			kthread->full_name = kvasprintf(GFP_KERNEL, namefmt, args);
+		}
 		set_task_comm(task, name);
 	}
 	kfree(create);
diff --git a/kernel/panic.c b/kernel/panic.c
index cefd7d82366f..55b50e052ec3 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -32,6 +32,7 @@
 #include <linux/bug.h>
 #include <linux/ratelimit.h>
 #include <linux/debugfs.h>
+#include <trace/events/error_report.h>
 #include <asm/sections.h>
 
 #define PANIC_TIMER_STEP 100
@@ -533,26 +534,9 @@ void oops_enter(void)
 		trigger_all_cpu_backtrace();
 }
 
-/*
- * 64-bit random ID for oopses:
- */
-static u64 oops_id;
-
-static int init_oops_id(void)
-{
-	if (!oops_id)
-		get_random_bytes(&oops_id, sizeof(oops_id));
-	else
-		oops_id++;
-
-	return 0;
-}
-late_initcall(init_oops_id);
-
 static void print_oops_end_marker(void)
 {
-	init_oops_id();
-	pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
+	pr_warn("---[ end trace %016llx ]---\n", 0ULL);
 }
 
 /*
@@ -609,6 +593,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 	print_irqtrace_events(current);
 
 	print_oops_end_marker();
+	trace_error_report_end(ERROR_DETECTOR_WARN, (unsigned long)caller);
 
 	/* Just a warning, don't kill lockdep. */
 	add_taint(taint, LOCKDEP_STILL_OK);
diff --git a/kernel/sys.c b/kernel/sys.c
index 2450a9f33cb0..ecc4cf019242 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -220,7 +220,6 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
 		niceval = MAX_NICE;
 
 	rcu_read_lock();
-	read_lock(&tasklist_lock);
 	switch (which) {
 	case PRIO_PROCESS:
 		if (who)
@@ -235,9 +234,11 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
 			pgrp = find_vpid(who);
 		else
 			pgrp = task_pgrp(current);
+		read_lock(&tasklist_lock);
 		do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
 			error = set_one_prio(p, niceval, error);
 		} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
+		read_unlock(&tasklist_lock);
 		break;
 	case PRIO_USER:
 		uid = make_kuid(cred->user_ns, who);
@@ -249,16 +250,15 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
 			if (!user)
 				goto out_unlock;	/* No processes for this user */
 		}
-		do_each_thread(g, p) {
+		for_each_process_thread(g, p) {
 			if (uid_eq(task_uid(p), uid) && task_pid_vnr(p))
 				error = set_one_prio(p, niceval, error);
-		} while_each_thread(g, p);
+		}
 		if (!uid_eq(uid, cred->uid))
 			free_uid(user);		/* For find_user() */
 		break;
 	}
 out_unlock:
-	read_unlock(&tasklist_lock);
 	rcu_read_unlock();
 out:
 	return error;
@@ -283,7 +283,6 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
 		return -EINVAL;
 
 	rcu_read_lock();
-	read_lock(&tasklist_lock);
 	switch (which) {
 	case PRIO_PROCESS:
 		if (who)
@@ -301,11 +300,13 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
 			pgrp = find_vpid(who);
 		else
 			pgrp = task_pgrp(current);
+		read_lock(&tasklist_lock);
 		do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
 			niceval = nice_to_rlimit(task_nice(p));
 			if (niceval > retval)
 				retval = niceval;
 		} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
+		read_unlock(&tasklist_lock);
 		break;
 	case PRIO_USER:
 		uid = make_kuid(cred->user_ns, who);
@@ -317,19 +318,18 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
 			if (!user)
 				goto out_unlock;	/* No processes for this user */
 		}
-		do_each_thread(g, p) {
+		for_each_process_thread(g, p) {
 			if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) {
 				niceval = nice_to_rlimit(task_nice(p));
 				if (niceval > retval)
 					retval = niceval;
 			}
-		} while_each_thread(g, p);
+		}
 		if (!uid_eq(uid, cred->uid))
 			free_uid(user);		/* for find_user() */
 		break;
 	}
 out_unlock:
-	read_unlock(&tasklist_lock);
 	rcu_read_unlock();
 
 	return retval;
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c77fe36bb3d8..14b89aa37c5c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1984,6 +1984,8 @@ config KCOV
 	bool "Code coverage for fuzzing"
 	depends on ARCH_HAS_KCOV
 	depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
+	depends on !ARCH_WANTS_NO_INSTR || STACK_VALIDATION || \
+		   GCC_VERSION >= 120000 || CLANG_VERSION >= 130000
 	select DEBUG_FS
 	select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
 	help
@@ -2222,12 +2224,11 @@ config TEST_RHASHTABLE
 
 	  If unsure, say N.
 
-config TEST_HASH
-	tristate "Perform selftest on hash functions"
+config TEST_SIPHASH
+	tristate "Perform selftest on siphash functions"
 	help
-	  Enable this option to test the kernel's integer (<linux/hash.h>),
-	  string (<linux/stringhash.h>), and siphash (<linux/siphash.h>)
-	  hash functions on boot (or module load).
+	  Enable this option to test the kernel's siphash (<linux/siphash.h>) hash
+	  functions on boot (or module load).
 
 	  This is intended to help people writing architecture-specific
 	  optimized versions.  If unsure, say N.
@@ -2371,6 +2372,25 @@ config BITFIELD_KUNIT
 
 	  If unsure, say N.
 
+config HASH_KUNIT_TEST
+	tristate "KUnit Test for integer hash functions" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  Enable this option to test the kernel's string (<linux/stringhash.h>), and
+	  integer (<linux/hash.h>) hash functions on boot.
+
+	  KUnit tests run during boot and output the results to the debug log
+	  in TAP format (https://testanything.org/). Only useful for kernel devs
+	  running the KUnit test harness, and not intended for inclusion into a
+	  production build.
+
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  This is intended to help people writing architecture-specific
+	  optimized versions. If unsure, say N.
+
 config RESOURCE_KUNIT_TEST
 	tristate "KUnit test for resource API"
 	depends on KUNIT
@@ -2502,6 +2522,7 @@ config TEST_KMOD
 	depends on m
 	depends on NETDEVICES && NET_CORE && INET # for TUN
 	depends on BLOCK
+	depends on PAGE_SIZE_LESS_THAN_256KB # for BTRFS
 	select TEST_LKM
 	select XFS_FS
 	select TUN
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index e5372a13511d..236c5cefc4cc 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -112,19 +112,6 @@ config UBSAN_UNREACHABLE
 	  This option enables -fsanitize=unreachable which checks for control
 	  flow reaching an expected-to-be-unreachable position.
 
-config UBSAN_OBJECT_SIZE
-	bool "Perform checking for accesses beyond the end of objects"
-	default UBSAN
-	# gcc hugely expands stack usage with -fsanitize=object-size
-	# https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/
-	depends on !CC_IS_GCC
-	depends on $(cc-option,-fsanitize=object-size)
-	help
-	  This option enables -fsanitize=object-size which checks for accesses
-	  beyond the end of objects where the optimizer can determine both the
-	  object being operated on and its size, usually seen with bad downcasts,
-	  or access to struct members from NULL pointers.
-
 config UBSAN_BOOL
 	bool "Perform checking for non-boolean values used as boolean"
 	default UBSAN
diff --git a/lib/Makefile b/lib/Makefile
index b213a7bbf3fd..300f569c626b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -61,7 +61,8 @@ obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
 obj-$(CONFIG_TEST_BITOPS) += test_bitops.o
 CFLAGS_test_bitops.o += -Werror
 obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
-obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
+obj-$(CONFIG_TEST_SIPHASH) += test_siphash.o
+obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
 obj-$(CONFIG_TEST_IDA) += test_ida.o
 obj-$(CONFIG_KASAN_KUNIT_TEST) += test_kasan.o
 CFLAGS_test_kasan.o += -fno-builtin
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index 059b8b00dc53..886510d248e5 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -22,6 +22,7 @@
 
 #include "kstrtox.h"
 
+noinline
 const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
 {
 	if (*base == 0) {
@@ -47,6 +48,7 @@ const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
  *
  * Don't you dare use this function.
  */
+noinline
 unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p,
 				  size_t max_chars)
 {
@@ -85,6 +87,7 @@ unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned lon
 	return rv;
 }
 
+noinline
 unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
 {
 	return _parse_integer_limit(s, base, p, INT_MAX);
@@ -125,6 +128,7 @@ static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
  * Preferred over simple_strtoull(). Return code must be checked.
  */
+noinline
 int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
 {
 	if (s[0] == '+')
@@ -148,6 +152,7 @@ EXPORT_SYMBOL(kstrtoull);
  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
  * Preferred over simple_strtoll(). Return code must be checked.
  */
+noinline
 int kstrtoll(const char *s, unsigned int base, long long *res)
 {
 	unsigned long long tmp;
@@ -219,6 +224,7 @@ EXPORT_SYMBOL(_kstrtol);
  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
  * Preferred over simple_strtoul(). Return code must be checked.
  */
+noinline
 int kstrtouint(const char *s, unsigned int base, unsigned int *res)
 {
 	unsigned long long tmp;
@@ -249,6 +255,7 @@ EXPORT_SYMBOL(kstrtouint);
  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
  * Preferred over simple_strtol(). Return code must be checked.
  */
+noinline
 int kstrtoint(const char *s, unsigned int base, int *res)
 {
 	long long tmp;
@@ -264,6 +271,7 @@ int kstrtoint(const char *s, unsigned int base, int *res)
 }
 EXPORT_SYMBOL(kstrtoint);
 
+noinline
 int kstrtou16(const char *s, unsigned int base, u16 *res)
 {
 	unsigned long long tmp;
@@ -279,6 +287,7 @@ int kstrtou16(const char *s, unsigned int base, u16 *res)
 }
 EXPORT_SYMBOL(kstrtou16);
 
+noinline
 int kstrtos16(const char *s, unsigned int base, s16 *res)
 {
 	long long tmp;
@@ -294,6 +303,7 @@ int kstrtos16(const char *s, unsigned int base, s16 *res)
 }
 EXPORT_SYMBOL(kstrtos16);
 
+noinline
 int kstrtou8(const char *s, unsigned int base, u8 *res)
 {
 	unsigned long long tmp;
@@ -309,6 +319,7 @@ int kstrtou8(const char *s, unsigned int base, u8 *res)
 }
 EXPORT_SYMBOL(kstrtou8);
 
+noinline
 int kstrtos8(const char *s, unsigned int base, s8 *res)
 {
 	long long tmp;
@@ -333,6 +344,7 @@ EXPORT_SYMBOL(kstrtos8);
  * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
  * pointed to by res is updated upon finding a match.
  */
+noinline
 int kstrtobool(const char *s, bool *res)
 {
 	if (!s)
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 5d5424b51b74..9daa3fb9d1cd 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -49,11 +49,11 @@ bool __list_del_entry_valid(struct list_head *entry)
 			"list_del corruption, %px->prev is LIST_POISON2 (%px)\n",
 			entry, LIST_POISON2) ||
 	    CHECK_DATA_CORRUPTION(prev->next != entry,
-			"list_del corruption. prev->next should be %px, but was %px\n",
-			entry, prev->next) ||
+			"list_del corruption. prev->next should be %px, but was %px. (prev=%px)\n",
+			entry, prev->next, prev) ||
 	    CHECK_DATA_CORRUPTION(next->prev != entry,
-			"list_del corruption. next->prev should be %px, but was %px\n",
-			entry, next->prev))
+			"list_del corruption. next->prev should be %px, but was %px. (next=%px)\n",
+			entry, next->prev, next))
 		return false;
 
 	return true;
diff --git a/lib/lz4/lz4defs.h b/lib/lz4/lz4defs.h
index 673bd206aa98..330aa539b46e 100644
--- a/lib/lz4/lz4defs.h
+++ b/lib/lz4/lz4defs.h
@@ -36,6 +36,8 @@
  */
 
 #include <asm/unaligned.h>
+
+#include <linux/bitops.h>
 #include <linux/string.h>	 /* memset, memcpy */
 
 #define FORCE_INLINE __always_inline
diff --git a/lib/test_hash.c b/lib/test_hash.c
index 0ee40b4a56dd..bb25fda34794 100644
--- a/lib/test_hash.c
+++ b/lib/test_hash.c
@@ -14,17 +14,15 @@
  * and hash_64().
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt "\n"
-
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/hash.h>
 #include <linux/stringhash.h>
-#include <linux/printk.h>
+#include <kunit/test.h>
 
 /* 32-bit XORSHIFT generator.  Seed must not be zero. */
-static u32 __init __attribute_const__
+static u32 __attribute_const__
 xorshift(u32 seed)
 {
 	seed ^= seed << 13;
@@ -34,7 +32,7 @@ xorshift(u32 seed)
 }
 
 /* Given a non-zero x, returns a non-zero byte. */
-static u8 __init __attribute_const__
+static u8 __attribute_const__
 mod255(u32 x)
 {
 	x = (x & 0xffff) + (x >> 16);	/* 1 <= x <= 0x1fffe */
@@ -45,8 +43,7 @@ mod255(u32 x)
 }
 
 /* Fill the buffer with non-zero bytes. */
-static void __init
-fill_buf(char *buf, size_t len, u32 seed)
+static void fill_buf(char *buf, size_t len, u32 seed)
 {
 	size_t i;
 
@@ -56,6 +53,50 @@ fill_buf(char *buf, size_t len, u32 seed)
 	}
 }
 
+/* Holds most testing variables for the int test. */
+struct test_hash_params {
+        /* Pointer to integer to be hashed. */
+	unsigned long long *h64;
+        /* Low 32-bits of integer to be hashed. */
+	u32 h0;
+        /* Arch-specific hash result. */
+	u32 h1;
+        /* Generic hash result. */
+	u32 h2;
+        /* ORed hashes of given size (in bits). */
+	u32 (*hash_or)[33];
+};
+
+#ifdef HAVE_ARCH__HASH_32
+static void
+test_int__hash_32(struct kunit *test, struct test_hash_params *params)
+{
+	params->hash_or[1][0] |= params->h2 = __hash_32_generic(params->h0);
+#if HAVE_ARCH__HASH_32 == 1
+	KUNIT_EXPECT_EQ_MSG(test, params->h1, params->h2,
+			    "__hash_32(%#x) = %#x != __hash_32_generic() = %#x",
+			    params->h0, params->h1, params->h2);
+#endif
+}
+#endif
+
+#ifdef HAVE_ARCH_HASH_64
+static void
+test_int_hash_64(struct kunit *test, struct test_hash_params *params, u32 const *m, int *k)
+{
+	params->h2 = hash_64_generic(*params->h64, *k);
+#if HAVE_ARCH_HASH_64 == 1
+	KUNIT_EXPECT_EQ_MSG(test, params->h1, params->h2,
+			    "hash_64(%#llx, %d) = %#x != hash_64_generic() = %#x",
+			    *params->h64, *k, params->h1, params->h2);
+#else
+	KUNIT_EXPECT_LE_MSG(test, params->h1, params->h2,
+			    "hash_64_generic(%#llx, %d) = %#x > %#x",
+			    *params->h64, *k, params->h1, *m);
+#endif
+}
+#endif
+
 /*
  * Test the various integer hash functions.  h64 (or its low-order bits)
  * is the integer to hash.  hash_or accumulates the OR of the hash values,
@@ -65,23 +106,16 @@ fill_buf(char *buf, size_t len, u32 seed)
  * inline, the code being tested is actually in the module, and you can
  * recompile and re-test the module without rebooting.
  */
-static bool __init
-test_int_hash(unsigned long long h64, u32 hash_or[2][33])
+static void
+test_int_hash(struct kunit *test, unsigned long long h64, u32 hash_or[2][33])
 {
 	int k;
-	u32 h0 = (u32)h64, h1, h2;
+	struct test_hash_params params = { &h64, (u32)h64, 0, 0, hash_or };
 
 	/* Test __hash32 */
-	hash_or[0][0] |= h1 = __hash_32(h0);
+	hash_or[0][0] |= params.h1 = __hash_32(params.h0);
 #ifdef HAVE_ARCH__HASH_32
-	hash_or[1][0] |= h2 = __hash_32_generic(h0);
-#if HAVE_ARCH__HASH_32 == 1
-	if (h1 != h2) {
-		pr_err("__hash_32(%#x) = %#x != __hash_32_generic() = %#x",
-			h0, h1, h2);
-		return false;
-	}
-#endif
+	test_int__hash_32(test, &params);
 #endif
 
 	/* Test k = 1..32 bits */
@@ -89,63 +123,53 @@ test_int_hash(unsigned long long h64, u32 hash_or[2][33])
 		u32 const m = ((u32)2 << (k-1)) - 1;	/* Low k bits set */
 
 		/* Test hash_32 */
-		hash_or[0][k] |= h1 = hash_32(h0, k);
-		if (h1 > m) {
-			pr_err("hash_32(%#x, %d) = %#x > %#x", h0, k, h1, m);
-			return false;
-		}
-#ifdef HAVE_ARCH_HASH_32
-		h2 = hash_32_generic(h0, k);
-#if HAVE_ARCH_HASH_32 == 1
-		if (h1 != h2) {
-			pr_err("hash_32(%#x, %d) = %#x != hash_32_generic() "
-				" = %#x", h0, k, h1, h2);
-			return false;
-		}
-#else
-		if (h2 > m) {
-			pr_err("hash_32_generic(%#x, %d) = %#x > %#x",
-				h0, k, h1, m);
-			return false;
-		}
-#endif
-#endif
+		hash_or[0][k] |= params.h1 = hash_32(params.h0, k);
+		KUNIT_EXPECT_LE_MSG(test, params.h1, m,
+				    "hash_32(%#x, %d) = %#x > %#x",
+				    params.h0, k, params.h1, m);
+
 		/* Test hash_64 */
-		hash_or[1][k] |= h1 = hash_64(h64, k);
-		if (h1 > m) {
-			pr_err("hash_64(%#llx, %d) = %#x > %#x", h64, k, h1, m);
-			return false;
-		}
+		hash_or[1][k] |= params.h1 = hash_64(h64, k);
+		KUNIT_EXPECT_LE_MSG(test, params.h1, m,
+				    "hash_64(%#llx, %d) = %#x > %#x",
+				    h64, k, params.h1, m);
 #ifdef HAVE_ARCH_HASH_64
-		h2 = hash_64_generic(h64, k);
-#if HAVE_ARCH_HASH_64 == 1
-		if (h1 != h2) {
-			pr_err("hash_64(%#llx, %d) = %#x != hash_64_generic() "
-				"= %#x", h64, k, h1, h2);
-			return false;
-		}
-#else
-		if (h2 > m) {
-			pr_err("hash_64_generic(%#llx, %d) = %#x > %#x",
-				h64, k, h1, m);
-			return false;
-		}
-#endif
+		test_int_hash_64(test, &params, &m, &k);
 #endif
 	}
-
-	(void)h2;	/* Suppress unused variable warning */
-	return true;
 }
 
 #define SIZE 256	/* Run time is cubic in SIZE */
 
-static int __init
-test_hash_init(void)
+static void test_string_or(struct kunit *test)
 {
 	char buf[SIZE+1];
-	u32 string_or = 0, hash_or[2][33] = { { 0, } };
-	unsigned tests = 0;
+	u32 string_or = 0;
+	int i, j;
+
+	fill_buf(buf, SIZE, 1);
+
+	/* Test every possible non-empty substring in the buffer. */
+	for (j = SIZE; j > 0; --j) {
+		buf[j] = '\0';
+
+		for (i = 0; i <= j; i++) {
+			u32 h0 = full_name_hash(buf+i, buf+i, j-i);
+
+			string_or |= h0;
+		} /* i */
+	} /* j */
+
+	/* The OR of all the hash values should cover all the bits */
+	KUNIT_EXPECT_EQ_MSG(test, string_or, -1u,
+			    "OR of all string hash results = %#x != %#x",
+			    string_or, -1u);
+}
+
+static void test_hash_or(struct kunit *test)
+{
+	char buf[SIZE+1];
+	u32 hash_or[2][33] = { { 0, } };
 	unsigned long long h64 = 0;
 	int i, j;
 
@@ -160,46 +184,27 @@ test_hash_init(void)
 			u32 h0 = full_name_hash(buf+i, buf+i, j-i);
 
 			/* Check that hashlen_string gets the length right */
-			if (hashlen_len(hashlen) != j-i) {
-				pr_err("hashlen_string(%d..%d) returned length"
-					" %u, expected %d",
-					i, j, hashlen_len(hashlen), j-i);
-				return -EINVAL;
-			}
+			KUNIT_EXPECT_EQ_MSG(test, hashlen_len(hashlen), j-i,
+					    "hashlen_string(%d..%d) returned length %u, expected %d",
+					    i, j, hashlen_len(hashlen), j-i);
 			/* Check that the hashes match */
-			if (hashlen_hash(hashlen) != h0) {
-				pr_err("hashlen_string(%d..%d) = %08x != "
-					"full_name_hash() = %08x",
-					i, j, hashlen_hash(hashlen), h0);
-				return -EINVAL;
-			}
+			KUNIT_EXPECT_EQ_MSG(test, hashlen_hash(hashlen), h0,
+					    "hashlen_string(%d..%d) = %08x != full_name_hash() = %08x",
+					    i, j, hashlen_hash(hashlen), h0);
 
-			string_or |= h0;
 			h64 = h64 << 32 | h0;	/* For use with hash_64 */
-			if (!test_int_hash(h64, hash_or))
-				return -EINVAL;
-			tests++;
+			test_int_hash(test, h64, hash_or);
 		} /* i */
 	} /* j */
 
-	/* The OR of all the hash values should cover all the bits */
-	if (~string_or) {
-		pr_err("OR of all string hash results = %#x != %#x",
-			string_or, -1u);
-		return -EINVAL;
-	}
-	if (~hash_or[0][0]) {
-		pr_err("OR of all __hash_32 results = %#x != %#x",
-			hash_or[0][0], -1u);
-		return -EINVAL;
-	}
+	KUNIT_EXPECT_EQ_MSG(test, hash_or[0][0], -1u,
+			    "OR of all __hash_32 results = %#x != %#x",
+			    hash_or[0][0], -1u);
 #ifdef HAVE_ARCH__HASH_32
 #if HAVE_ARCH__HASH_32 != 1	/* Test is pointless if results match */
-	if (~hash_or[1][0]) {
-		pr_err("OR of all __hash_32_generic results = %#x != %#x",
-			hash_or[1][0], -1u);
-		return -EINVAL;
-	}
+	KUNIT_EXPECT_EQ_MSG(test, hash_or[1][0], -1u,
+			    "OR of all __hash_32_generic results = %#x != %#x",
+			    hash_or[1][0], -1u);
 #endif
 #endif
 
@@ -207,51 +212,27 @@ test_hash_init(void)
 	for (i = 1; i <= 32; i++) {
 		u32 const m = ((u32)2 << (i-1)) - 1;	/* Low i bits set */
 
-		if (hash_or[0][i] != m) {
-			pr_err("OR of all hash_32(%d) results = %#x "
-				"(%#x expected)", i, hash_or[0][i], m);
-			return -EINVAL;
-		}
-		if (hash_or[1][i] != m) {
-			pr_err("OR of all hash_64(%d) results = %#x "
-				"(%#x expected)", i, hash_or[1][i], m);
-			return -EINVAL;
-		}
+		KUNIT_EXPECT_EQ_MSG(test, hash_or[0][i], m,
+				    "OR of all hash_32(%d) results = %#x (%#x expected)",
+				    i, hash_or[0][i], m);
+		KUNIT_EXPECT_EQ_MSG(test, hash_or[1][i], m,
+				    "OR of all hash_64(%d) results = %#x (%#x expected)",
+				    i, hash_or[1][i], m);
 	}
+}
 
-	/* Issue notices about skipped tests. */
-#ifdef HAVE_ARCH__HASH_32
-#if HAVE_ARCH__HASH_32 != 1
-	pr_info("__hash_32() is arch-specific; not compared to generic.");
-#endif
-#else
-	pr_info("__hash_32() has no arch implementation to test.");
-#endif
-#ifdef HAVE_ARCH_HASH_32
-#if HAVE_ARCH_HASH_32 != 1
-	pr_info("hash_32() is arch-specific; not compared to generic.");
-#endif
-#else
-	pr_info("hash_32() has no arch implementation to test.");
-#endif
-#ifdef HAVE_ARCH_HASH_64
-#if HAVE_ARCH_HASH_64 != 1
-	pr_info("hash_64() is arch-specific; not compared to generic.");
-#endif
-#else
-	pr_info("hash_64() has no arch implementation to test.");
-#endif
-
-	pr_notice("%u tests passed.", tests);
+static struct kunit_case hash_test_cases[] __refdata = {
+	KUNIT_CASE(test_string_or),
+	KUNIT_CASE(test_hash_or),
+	{}
+};
 
-	return 0;
-}
+static struct kunit_suite hash_test_suite = {
+	.name = "hash",
+	.test_cases = hash_test_cases,
+};
 
-static void __exit test_hash_exit(void)
-{
-}
 
-module_init(test_hash_init);	/* Does everything */
-module_exit(test_hash_exit);	/* Does nothing */
+kunit_test_suite(hash_test_suite);
 
 MODULE_LICENSE("GPL");
diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index e4f706a404b3..3ca717f11397 100644
--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -337,6 +337,7 @@ static int __init do_kmem_cache_size_bulk(int size, int *total_failures)
 		if (num)
 			kmem_cache_free_bulk(c, num, objects);
 	}
+	kmem_cache_destroy(c);
 	*total_failures += fail;
 	return 1;
 }
diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c
index 7e7bbd0f3fd2..2062be1f2e80 100644
--- a/lib/test_ubsan.c
+++ b/lib/test_ubsan.c
@@ -79,15 +79,6 @@ static void test_ubsan_load_invalid_value(void)
 	eval2 = eval;
 }
 
-static void test_ubsan_null_ptr_deref(void)
-{
-	volatile int *ptr = NULL;
-	int val;
-
-	UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
-	val = *ptr;
-}
-
 static void test_ubsan_misaligned_access(void)
 {
 	volatile char arr[5] __aligned(4) = {1, 2, 3, 4, 5};
@@ -98,29 +89,16 @@ static void test_ubsan_misaligned_access(void)
 	*ptr = val;
 }
 
-static void test_ubsan_object_size_mismatch(void)
-{
-	/* "((aligned(8)))" helps this not into be misaligned for ptr-access. */
-	volatile int val __aligned(8) = 4;
-	volatile long long *ptr, val2;
-
-	UBSAN_TEST(CONFIG_UBSAN_OBJECT_SIZE);
-	ptr = (long long *)&val;
-	val2 = *ptr;
-}
-
 static const test_ubsan_fp test_ubsan_array[] = {
 	test_ubsan_shift_out_of_bounds,
 	test_ubsan_out_of_bounds,
 	test_ubsan_load_invalid_value,
 	test_ubsan_misaligned_access,
-	test_ubsan_object_size_mismatch,
 };
 
 /* Excluded because they Oops the module. */
 static const test_ubsan_fp skip_ubsan_array[] = {
 	test_ubsan_divrem_overflow,
-	test_ubsan_null_ptr_deref,
 };
 
 static int __init test_ubsan_init(void)
diff --git a/mm/Kconfig b/mm/Kconfig
index 53d7485fc38f..a99bd499ef51 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -432,6 +432,18 @@ config NEED_PER_CPU_KM
 	bool
 	default y
 
+config NEED_PER_CPU_EMBED_FIRST_CHUNK
+	bool
+
+config NEED_PER_CPU_PAGE_FIRST_CHUNK
+	bool
+
+config USE_PERCPU_NUMA_NODE_ID
+	bool
+
+config HAVE_SETUP_PER_CPU_AREA
+	bool
+
 config CLEANCACHE
 	bool "Enable cleancache driver to cache clean pages if tmem is present"
 	help
diff --git a/mm/memory.c b/mm/memory.c
index f306e698a1e3..c125c4969913 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3529,7 +3529,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 	if (unlikely(!si))
 		goto out;
 
-	delayacct_set_flag(current, DELAYACCT_PF_SWAPIN);
 	page = lookup_swap_cache(entry, vma, vmf->address);
 	swapcache = page;
 
@@ -3577,7 +3576,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 					vmf->address, &vmf->ptl);
 			if (likely(pte_same(*vmf->pte, vmf->orig_pte)))
 				ret = VM_FAULT_OOM;
-			delayacct_clear_flag(current, DELAYACCT_PF_SWAPIN);
 			goto unlock;
 		}
 
@@ -3591,13 +3589,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 		 * owner processes (which may be unknown at hwpoison time)
 		 */
 		ret = VM_FAULT_HWPOISON;
-		delayacct_clear_flag(current, DELAYACCT_PF_SWAPIN);
 		goto out_release;
 	}
 
 	locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags);
 
-	delayacct_clear_flag(current, DELAYACCT_PF_SWAPIN);
 	if (!locked) {
 		ret |= VM_FAULT_RETRY;
 		goto out_release;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d4205e5e41d1..3589febc6d31 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -74,6 +74,7 @@
 #include <linux/padata.h>
 #include <linux/khugepaged.h>
 #include <linux/buffer_head.h>
+#include <linux/delayacct.h>
 #include <asm/sections.h>
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -4365,6 +4366,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
 		return NULL;
 
 	psi_memstall_enter(&pflags);
+	delayacct_compact_start();
 	noreclaim_flag = memalloc_noreclaim_save();
 
 	*compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac,
@@ -4372,6 +4374,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
 
 	memalloc_noreclaim_restore(noreclaim_flag);
 	psi_memstall_leave(&pflags);
+	delayacct_compact_end();
 
 	if (*compact_result == COMPACT_SKIPPED)
 		return NULL;
diff --git a/mm/page_io.c b/mm/page_io.c
index 9725c7e1eeea..0bf8e40f4e57 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -25,6 +25,7 @@
 #include <linux/psi.h>
 #include <linux/uio.h>
 #include <linux/sched/task.h>
+#include <linux/delayacct.h>
 
 void end_swap_bio_write(struct bio *bio)
 {
@@ -370,6 +371,7 @@ int swap_readpage(struct page *page, bool synchronous)
 	 * significant part of overall IO time.
 	 */
 	psi_memstall_enter(&pflags);
+	delayacct_swapin_start();
 
 	if (frontswap_load(page) == 0) {
 		SetPageUptodate(page);
@@ -432,6 +434,7 @@ int swap_readpage(struct page *page, bool synchronous)
 
 out:
 	psi_memstall_leave(&pflags);
+	delayacct_swapin_end();
 	return ret;
 }
 
diff --git a/mm/percpu.c b/mm/percpu.c
index 4199a0604c32..a188ac9a267d 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -2992,6 +2992,42 @@ static struct pcpu_alloc_info * __init __flatten pcpu_build_alloc_info(
 
 	return ai;
 }
+
+static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align,
+				   pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn)
+{
+	const unsigned long goal = __pa(MAX_DMA_ADDRESS);
+#ifdef CONFIG_NUMA
+	int node = NUMA_NO_NODE;
+	void *ptr;
+
+	if (cpu_to_nd_fn)
+		node = cpu_to_nd_fn(cpu);
+
+	if (node == NUMA_NO_NODE || !node_online(node) || !NODE_DATA(node)) {
+		ptr = memblock_alloc_from(size, align, goal);
+		pr_info("cpu %d has no node %d or node-local memory\n",
+			cpu, node);
+		pr_debug("per cpu data for cpu%d %zu bytes at 0x%llx\n",
+			 cpu, size, (u64)__pa(ptr));
+	} else {
+		ptr = memblock_alloc_try_nid(size, align, goal,
+					     MEMBLOCK_ALLOC_ACCESSIBLE,
+					     node);
+
+		pr_debug("per cpu data for cpu%d %zu bytes on node%d at 0x%llx\n",
+			 cpu, size, node, (u64)__pa(ptr));
+	}
+	return ptr;
+#else
+	return memblock_alloc_from(size, align, goal);
+#endif
+}
+
+static void __init pcpu_fc_free(void *ptr, size_t size)
+{
+	memblock_free(ptr, size);
+}
 #endif /* BUILD_EMBED_FIRST_CHUNK || BUILD_PAGE_FIRST_CHUNK */
 
 #if defined(BUILD_EMBED_FIRST_CHUNK)
@@ -3001,14 +3037,13 @@ static struct pcpu_alloc_info * __init __flatten pcpu_build_alloc_info(
  * @dyn_size: minimum free size for dynamic allocation in bytes
  * @atom_size: allocation atom size
  * @cpu_distance_fn: callback to determine distance between cpus, optional
- * @alloc_fn: function to allocate percpu page
- * @free_fn: function to free percpu page
+ * @cpu_to_nd_fn: callback to convert cpu to it's node, optional
  *
  * This is a helper to ease setting up embedded first percpu chunk and
  * can be called where pcpu_setup_first_chunk() is expected.
  *
  * If this function is used to setup the first chunk, it is allocated
- * by calling @alloc_fn and used as-is without being mapped into
+ * by calling pcpu_fc_alloc and used as-is without being mapped into
  * vmalloc area.  Allocations are always whole multiples of @atom_size
  * aligned to @atom_size.
  *
@@ -3022,7 +3057,7 @@ static struct pcpu_alloc_info * __init __flatten pcpu_build_alloc_info(
  * @dyn_size specifies the minimum dynamic area size.
  *
  * If the needed size is smaller than the minimum or specified unit
- * size, the leftover is returned using @free_fn.
+ * size, the leftover is returned using pcpu_fc_free.
  *
  * RETURNS:
  * 0 on success, -errno on failure.
@@ -3030,8 +3065,7 @@ static struct pcpu_alloc_info * __init __flatten pcpu_build_alloc_info(
 int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 				  size_t atom_size,
 				  pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
-				  pcpu_fc_alloc_fn_t alloc_fn,
-				  pcpu_fc_free_fn_t free_fn)
+				  pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn)
 {
 	void *base = (void *)ULONG_MAX;
 	void **areas = NULL;
@@ -3066,7 +3100,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 		BUG_ON(cpu == NR_CPUS);
 
 		/* allocate space for the whole group */
-		ptr = alloc_fn(cpu, gi->nr_units * ai->unit_size, atom_size);
+		ptr = pcpu_fc_alloc(cpu, gi->nr_units * ai->unit_size, atom_size, cpu_to_nd_fn);
 		if (!ptr) {
 			rc = -ENOMEM;
 			goto out_free_areas;
@@ -3105,12 +3139,12 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 		for (i = 0; i < gi->nr_units; i++, ptr += ai->unit_size) {
 			if (gi->cpu_map[i] == NR_CPUS) {
 				/* unused unit, free whole */
-				free_fn(ptr, ai->unit_size);
+				pcpu_fc_free(ptr, ai->unit_size);
 				continue;
 			}
 			/* copy and return the unused part */
 			memcpy(ptr, __per_cpu_load, ai->static_size);
-			free_fn(ptr + size_sum, ai->unit_size - size_sum);
+			pcpu_fc_free(ptr + size_sum, ai->unit_size - size_sum);
 		}
 	}
 
@@ -3129,7 +3163,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 out_free_areas:
 	for (group = 0; group < ai->nr_groups; group++)
 		if (areas[group])
-			free_fn(areas[group],
+			pcpu_fc_free(areas[group],
 				ai->groups[group].nr_units * ai->unit_size);
 out_free:
 	pcpu_free_alloc_info(ai);
@@ -3140,12 +3174,79 @@ out_free:
 #endif /* BUILD_EMBED_FIRST_CHUNK */
 
 #ifdef BUILD_PAGE_FIRST_CHUNK
+#include <asm/pgalloc.h>
+
+#ifndef P4D_TABLE_SIZE
+#define P4D_TABLE_SIZE PAGE_SIZE
+#endif
+
+#ifndef PUD_TABLE_SIZE
+#define PUD_TABLE_SIZE PAGE_SIZE
+#endif
+
+#ifndef PMD_TABLE_SIZE
+#define PMD_TABLE_SIZE PAGE_SIZE
+#endif
+
+#ifndef PTE_TABLE_SIZE
+#define PTE_TABLE_SIZE PAGE_SIZE
+#endif
+void __init __weak pcpu_populate_pte(unsigned long addr)
+{
+	pgd_t *pgd = pgd_offset_k(addr);
+	p4d_t *p4d;
+	pud_t *pud;
+	pmd_t *pmd;
+
+	if (pgd_none(*pgd)) {
+		p4d_t *new;
+
+		new = memblock_alloc(P4D_TABLE_SIZE, P4D_TABLE_SIZE);
+		if (!new)
+			goto err_alloc;
+		pgd_populate(&init_mm, pgd, new);
+	}
+
+	p4d = p4d_offset(pgd, addr);
+	if (p4d_none(*p4d)) {
+		pud_t *new;
+
+		new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
+		if (!new)
+			goto err_alloc;
+		p4d_populate(&init_mm, p4d, new);
+	}
+
+	pud = pud_offset(p4d, addr);
+	if (pud_none(*pud)) {
+		pmd_t *new;
+
+		new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
+		if (!new)
+			goto err_alloc;
+		pud_populate(&init_mm, pud, new);
+	}
+
+	pmd = pmd_offset(pud, addr);
+	if (!pmd_present(*pmd)) {
+		pte_t *new;
+
+		new = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE);
+		if (!new)
+			goto err_alloc;
+		pmd_populate_kernel(&init_mm, pmd, new);
+	}
+
+	return;
+
+err_alloc:
+	panic("%s: Failed to allocate memory\n", __func__);
+}
+
 /**
  * pcpu_page_first_chunk - map the first chunk using PAGE_SIZE pages
  * @reserved_size: the size of reserved percpu area in bytes
- * @alloc_fn: function to allocate percpu page, always called with PAGE_SIZE
- * @free_fn: function to free percpu page, always called with PAGE_SIZE
- * @populate_pte_fn: function to populate pte
+ * @cpu_to_nd_fn: callback to convert cpu to it's node, optional
  *
  * This is a helper to ease setting up page-remapped first percpu
  * chunk and can be called where pcpu_setup_first_chunk() is expected.
@@ -3156,10 +3257,7 @@ out_free:
  * RETURNS:
  * 0 on success, -errno on failure.
  */
-int __init pcpu_page_first_chunk(size_t reserved_size,
-				 pcpu_fc_alloc_fn_t alloc_fn,
-				 pcpu_fc_free_fn_t free_fn,
-				 pcpu_fc_populate_pte_fn_t populate_pte_fn)
+int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn)
 {
 	static struct vm_struct vm;
 	struct pcpu_alloc_info *ai;
@@ -3201,7 +3299,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
 		for (i = 0; i < unit_pages; i++) {
 			void *ptr;
 
-			ptr = alloc_fn(cpu, PAGE_SIZE, PAGE_SIZE);
+			ptr = pcpu_fc_alloc(cpu, PAGE_SIZE, PAGE_SIZE, cpu_to_nd_fn);
 			if (!ptr) {
 				pr_warn("failed to allocate %s page for cpu%u\n",
 						psize_str, cpu);
@@ -3223,7 +3321,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
 			(unsigned long)vm.addr + unit * ai->unit_size;
 
 		for (i = 0; i < unit_pages; i++)
-			populate_pte_fn(unit_addr + (i << PAGE_SHIFT));
+			pcpu_populate_pte(unit_addr + (i << PAGE_SHIFT));
 
 		/* pte already populated, the following shouldn't fail */
 		rc = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages],
@@ -3253,7 +3351,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
 
 enomem:
 	while (--j >= 0)
-		free_fn(page_address(pages[j]), PAGE_SIZE);
+		pcpu_fc_free(page_address(pages[j]), PAGE_SIZE);
 	rc = -ENOMEM;
 out_free_ar:
 	memblock_free(pages, pages_size);
@@ -3278,17 +3376,6 @@ out_free_ar:
 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 EXPORT_SYMBOL(__per_cpu_offset);
 
-static void * __init pcpu_dfl_fc_alloc(unsigned int cpu, size_t size,
-				       size_t align)
-{
-	return  memblock_alloc_from(size, align, __pa(MAX_DMA_ADDRESS));
-}
-
-static void __init pcpu_dfl_fc_free(void *ptr, size_t size)
-{
-	memblock_free(ptr, size);
-}
-
 void __init setup_per_cpu_areas(void)
 {
 	unsigned long delta;
@@ -3299,9 +3386,8 @@ void __init setup_per_cpu_areas(void)
 	 * Always reserve area for module percpu variables.  That's
 	 * what the legacy allocator did.
 	 */
-	rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
-				    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, NULL,
-				    pcpu_dfl_fc_alloc, pcpu_dfl_fc_free);
+	rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, PERCPU_DYNAMIC_RESERVE,
+				    PAGE_SIZE, NULL, NULL);
 	if (rc < 0)
 		panic("Failed to initialize percpu areas.");
 
diff --git a/samples/bpf/offwaketime_kern.c b/samples/bpf/offwaketime_kern.c
index 4866afd054da..eb4d94742e6b 100644
--- a/samples/bpf/offwaketime_kern.c
+++ b/samples/bpf/offwaketime_kern.c
@@ -113,11 +113,11 @@ static inline int update_counts(void *ctx, u32 pid, u64 delta)
 /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
 struct sched_switch_args {
 	unsigned long long pad;
-	char prev_comm[16];
+	char prev_comm[TASK_COMM_LEN];
 	int prev_pid;
 	int prev_prio;
 	long long prev_state;
-	char next_comm[16];
+	char next_comm[TASK_COMM_LEN];
 	int next_pid;
 	int next_prio;
 };
diff --git a/samples/bpf/test_overhead_kprobe_kern.c b/samples/bpf/test_overhead_kprobe_kern.c
index f6d593e47037..8fdd2c9c56b2 100644
--- a/samples/bpf/test_overhead_kprobe_kern.c
+++ b/samples/bpf/test_overhead_kprobe_kern.c
@@ -6,6 +6,7 @@
  */
 #include <linux/version.h>
 #include <linux/ptrace.h>
+#include <linux/sched.h>
 #include <uapi/linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
@@ -22,17 +23,17 @@ int prog(struct pt_regs *ctx)
 {
 	struct signal_struct *signal;
 	struct task_struct *tsk;
-	char oldcomm[16] = {};
-	char newcomm[16] = {};
+	char oldcomm[TASK_COMM_LEN] = {};
+	char newcomm[TASK_COMM_LEN] = {};
 	u16 oom_score_adj;
 	u32 pid;
 
 	tsk = (void *)PT_REGS_PARM1(ctx);
 
 	pid = _(tsk->pid);
-	bpf_probe_read_kernel(oldcomm, sizeof(oldcomm), &tsk->comm);
-	bpf_probe_read_kernel(newcomm, sizeof(newcomm),
-			      (void *)PT_REGS_PARM2(ctx));
+	bpf_probe_read_kernel_str(oldcomm, sizeof(oldcomm), &tsk->comm);
+	bpf_probe_read_kernel_str(newcomm, sizeof(newcomm),
+				  (void *)PT_REGS_PARM2(ctx));
 	signal = _(tsk->signal);
 	oom_score_adj = _(signal->oom_score_adj);
 	return 0;
diff --git a/samples/bpf/test_overhead_tp_kern.c b/samples/bpf/test_overhead_tp_kern.c
index eaa32693f8fc..80edadacb692 100644
--- a/samples/bpf/test_overhead_tp_kern.c
+++ b/samples/bpf/test_overhead_tp_kern.c
@@ -4,6 +4,7 @@
  * modify it under the terms of version 2 of the GNU General Public
  * License as published by the Free Software Foundation.
  */
+#include <linux/sched.h>
 #include <uapi/linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
@@ -11,8 +12,8 @@
 struct task_rename {
 	__u64 pad;
 	__u32 pid;
-	char oldcomm[16];
-	char newcomm[16];
+	char oldcomm[TASK_COMM_LEN];
+	char newcomm[TASK_COMM_LEN];
 	__u16 oom_score_adj;
 };
 SEC("tracepoint/task/task_rename")
diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
index 9e2092fd5206..7099c603ff0a 100644
--- a/scripts/Makefile.ubsan
+++ b/scripts/Makefile.ubsan
@@ -8,7 +8,6 @@ ubsan-cflags-$(CONFIG_UBSAN_LOCAL_BOUNDS)	+= -fsanitize=local-bounds
 ubsan-cflags-$(CONFIG_UBSAN_SHIFT)		+= -fsanitize=shift
 ubsan-cflags-$(CONFIG_UBSAN_DIV_ZERO)		+= -fsanitize=integer-divide-by-zero
 ubsan-cflags-$(CONFIG_UBSAN_UNREACHABLE)	+= -fsanitize=unreachable
-ubsan-cflags-$(CONFIG_UBSAN_OBJECT_SIZE)	+= -fsanitize=object-size
 ubsan-cflags-$(CONFIG_UBSAN_BOOL)		+= -fsanitize=bool
 ubsan-cflags-$(CONFIG_UBSAN_ENUM)		+= -fsanitize=enum
 ubsan-cflags-$(CONFIG_UBSAN_TRAP)		+= -fsanitize-undefined-trap-on-error
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1784921c645d..b01c36a15d9d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3172,7 +3172,7 @@ sub process {
 		    length($line) > 75 &&
 		    !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
 					# file delta changes
-		      $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
+		      $line =~ /^\s*(?:[\w\.\-\+]*\/)++[\w\.\-\+]+:/ ||
 					# filename then :
 		      $line =~ /^\s*(?:Fixes:|Link:|$signature_tags)/i ||
 					# A Fixes: or Link: line or signature tag line
@@ -3479,47 +3479,47 @@ sub process {
 		    # Kconfig supports named choices), so use a word boundary
 		    # (\b) rather than a whitespace character (\s)
 		    $line =~ /^\+\s*(?:config|menuconfig|choice)\b/) {
-			my $length = 0;
-			my $cnt = $realcnt;
-			my $ln = $linenr + 1;
-			my $f;
-			my $is_start = 0;
-			my $is_end = 0;
-			for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
-				$f = $lines[$ln - 1];
-				$cnt-- if ($lines[$ln - 1] !~ /^-/);
-				$is_end = $lines[$ln - 1] =~ /^\+/;
+			my $ln = $linenr;
+			my $needs_help = 0;
+			my $has_help = 0;
+			my $help_length = 0;
+			while (defined $lines[$ln]) {
+				my $f = $lines[$ln++];
 
 				next if ($f =~ /^-/);
-				last if (!$file && $f =~ /^\@\@/);
+				last if ($f !~ /^[\+ ]/);	# !patch context
 
-				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {
-					$is_start = 1;
-				} elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
-					$length = -1;
+				if ($f =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {
+					$needs_help = 1;
+					next;
+				}
+				if ($f =~ /^\+\s*help\s*$/) {
+					$has_help = 1;
+					next;
 				}
 
-				$f =~ s/^.//;
-				$f =~ s/#.*//;
-				$f =~ s/^\s+//;
-				next if ($f =~ /^$/);
+				$f =~ s/^.//;	# strip patch context [+ ]
+				$f =~ s/#.*//;	# strip # directives
+				$f =~ s/^\s+//;	# strip leading blanks
+				next if ($f =~ /^$/);	# skip blank lines
 
+				# At the end of this Kconfig block:
 				# This only checks context lines in the patch
 				# and so hopefully shouldn't trigger false
 				# positives, even though some of these are
 				# common words in help texts
-				if ($f =~ /^\s*(?:config|menuconfig|choice|endchoice|
-						  if|endif|menu|endmenu|source)\b/x) {
-					$is_end = 1;
+				if ($f =~ /^(?:config|menuconfig|choice|endchoice|
+					       if|endif|menu|endmenu|source)\b/x) {
 					last;
 				}
-				$length++;
+				$help_length++ if ($has_help);
 			}
-			if ($is_start && $is_end && $length < $min_conf_desc_length) {
+			if ($needs_help &&
+			    $help_length < $min_conf_desc_length) {
+				my $stat_real = get_stat_real($linenr, $ln - 1);
 				WARN("CONFIG_DESCRIPTION",
-				     "please write a paragraph that describes the config symbol fully\n" . $herecurr);
+				     "please write a help paragraph that fully describes the config symbol\n" . "$here\n$stat_real\n");
 			}
-			#print "is_start<$is_start> is_end<$is_end> length<$length>\n";
 		}
 
 # check MAINTAINERS entries
diff --git a/scripts/const_structs.checkpatch b/scripts/const_structs.checkpatch
index 3980985205a0..1eeb7b42c5b9 100644
--- a/scripts/const_structs.checkpatch
+++ b/scripts/const_structs.checkpatch
@@ -12,19 +12,27 @@ driver_info
 drm_connector_funcs
 drm_encoder_funcs
 drm_encoder_helper_funcs
+dvb_frontend_ops
+dvb_tuner_ops
 ethtool_ops
 extent_io_ops
+fb_ops
 file_lock_operations
 file_operations
 hv_ops
+hwmon_ops
+ib_device_ops
 ide_dma_ops
 ide_port_ops
+ieee80211_ops
+iio_buffer_setup_ops
 inode_operations
 intel_dvo_dev_ops
 irq_domain_ops
 item_operations
 iwl_cfg
 iwl_ops
+kernel_param_ops
 kgdb_arch
 kgdb_io
 kset_uevent_ops
@@ -32,25 +40,33 @@ lock_manager_operations
 machine_desc
 microcode_ops
 mlxsw_reg_info
+mtd_ooblayout_ops
 mtrr_ops
+nand_controller_ops
 neigh_ops
 net_device_ops
+nft_expr_ops
 nlmsvc_binding
 nvkm_device_chip
 of_device_id
 pci_raw_ops
 phy_ops
+pinconf_ops
 pinctrl_ops
 pinmux_ops
 pipe_buf_operations
 platform_hibernation_ops
 platform_suspend_ops
+proc_ops
 proto_ops
+pwm_ops
 regmap_access_table
 regulator_ops
+reset_control_ops
 rpc_pipe_ops
 rtc_class_ops
 sd_desc
+sdhci_ops
 seq_operations
 sirfsoc_padmux
 snd_ac97_build_ops
@@ -67,6 +83,13 @@ uart_ops
 usb_mon_operations
 v4l2_ctrl_ops
 v4l2_ioctl_ops
+v4l2_subdev_core_ops
+v4l2_subdev_internal_ops
+v4l2_subdev_ops
+v4l2_subdev_pad_ops
+v4l2_subdev_video_ops
+vb2_ops
 vm_operations_struct
 wacom_features
+watchdog_ops
 wd_ops
diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index 2075db0c08b8..6bd5221d37b8 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -1718,7 +1718,7 @@ sub vcs_exists {
     %VCS_cmds = %VCS_cmds_hg;
     return 2 if eval $VCS_cmds{"available"};
     %VCS_cmds = ();
-    if (!$printed_novcs) {
+    if (!$printed_novcs && $email_git) {
 	warn("$P: No supported VCS found.  Add --nogit to options?\n");
 	warn("Using a git repository produces better results.\n");
 	warn("Try Linus Torvalds' latest git repository using:\n");
diff --git a/tools/accounting/getdelays.c b/tools/accounting/getdelays.c
index 5ef1c15e88ad..11e86739456d 100644
--- a/tools/accounting/getdelays.c
+++ b/tools/accounting/getdelays.c
@@ -205,6 +205,8 @@ static void print_delayacct(struct taskstats *t)
 	       "RECLAIM  %12s%15s%15s\n"
 	       "      %15llu%15llu%15llums\n"
 	       "THRASHING%12s%15s%15s\n"
+	       "      %15llu%15llu%15llums\n"
+	       "COMPACT  %12s%15s%15s\n"
 	       "      %15llu%15llu%15llums\n",
 	       "count", "real total", "virtual total",
 	       "delay total", "delay average",
@@ -228,7 +230,11 @@ static void print_delayacct(struct taskstats *t)
 	       "count", "delay total", "delay average",
 	       (unsigned long long)t->thrashing_count,
 	       (unsigned long long)t->thrashing_delay_total,
-	       average_ms(t->thrashing_delay_total, t->thrashing_count));
+	       average_ms(t->thrashing_delay_total, t->thrashing_count),
+	       "count", "delay total", "delay average",
+	       (unsigned long long)t->compact_count,
+	       (unsigned long long)t->compact_delay_total,
+	       average_ms(t->compact_delay_total, t->compact_count));
 }
 
 static void task_context_switch_counts(struct taskstats *t)
diff --git a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
index d9b420972934..f70702fcb224 100644
--- a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
+++ b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
@@ -71,8 +71,8 @@ int iter(struct bpf_iter__task_file *ctx)
 
 	e.pid = task->tgid;
 	e.id = get_obj_id(file->private_data, obj_type);
-	bpf_probe_read_kernel(&e.comm, sizeof(e.comm),
-			      task->group_leader->comm);
+	bpf_probe_read_kernel_str(&e.comm, sizeof(e.comm),
+				  task->group_leader->comm);
 	bpf_seq_write(ctx->meta->seq, &e, sizeof(e));
 
 	return 0;
diff --git a/tools/include/linux/hash.h b/tools/include/linux/hash.h
index ad6fa21d977b..38edaa08f862 100644
--- a/tools/include/linux/hash.h
+++ b/tools/include/linux/hash.h
@@ -62,10 +62,7 @@ static inline u32 __hash_32_generic(u32 val)
 	return val * GOLDEN_RATIO_32;
 }
 
-#ifndef HAVE_ARCH_HASH_32
-#define hash_32 hash_32_generic
-#endif
-static inline u32 hash_32_generic(u32 val, unsigned int bits)
+static inline u32 hash_32(u32 val, unsigned int bits)
 {
 	/* High bits are more random, so use them. */
 	return __hash_32(val) >> (32 - bits);
diff --git a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
index a8233e7f173b..728dbd39eff0 100644
--- a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
+++ b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2018 Facebook
 
-#include <linux/bpf.h>
+#include <vmlinux.h>
 #include <bpf/bpf_helpers.h>
 
 #ifndef PERF_MAX_STACK_DEPTH
@@ -41,11 +41,11 @@ struct {
 /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
 struct sched_switch_args {
 	unsigned long long pad;
-	char prev_comm[16];
+	char prev_comm[TASK_COMM_LEN];
 	int prev_pid;
 	int prev_prio;
 	long long prev_state;
-	char next_comm[16];
+	char next_comm[TASK_COMM_LEN];
 	int next_pid;
 	int next_prio;
 };
diff --git a/tools/testing/selftests/bpf/progs/test_tracepoint.c b/tools/testing/selftests/bpf/progs/test_tracepoint.c
index ce6974016f53..43bd7a20cc50 100644
--- a/tools/testing/selftests/bpf/progs/test_tracepoint.c
+++ b/tools/testing/selftests/bpf/progs/test_tracepoint.c
@@ -1,17 +1,17 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2017 Facebook
 
-#include <linux/bpf.h>
+#include <vmlinux.h>
 #include <bpf/bpf_helpers.h>
 
 /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
 struct sched_switch_args {
 	unsigned long long pad;
-	char prev_comm[16];
+	char prev_comm[TASK_COMM_LEN];
 	int prev_pid;
 	int prev_prio;
 	long long prev_state;
-	char next_comm[16];
+	char next_comm[TASK_COMM_LEN];
 	int next_pid;
 	int next_prio;
 };