mm: remove CONFIG_NO_BOOTMEM

All achitectures select NO_BOOTMEM which essentially becomes 'Y' for any
kernel configuration and therefore it can be removed.

[alexander.h.duyck@linux.intel.com: remove now defunct NO_BOOTMEM from depends list for deferred init]
  Link: http://lkml.kernel.org/r/20180925201814.3576.15105.stgit@localhost.localdomain
Link: http://lkml.kernel.org/r/1536927045-23536-3-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Serge Semin <fancer.lancer@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

29 files changed, 4 insertions, 76 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 620b0a711ee4..04de6be101bc 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -32,7 +32,6 @@ config ALPHA
 	select OLD_SIGSUSPEND
 	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	help
 	  The Alpha is a 64-bit general-purpose processor designed and
 	  marketed by the Digital Equipment Corporation of blessed memory,
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index e98c6b8e6186..56995f356f69 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -44,7 +44,6 @@ config ARC
 	select HANDLE_DOMAIN_IRQ
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b8c6062ca0c1..37d4c40f405a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -100,7 +100,6 @@ config ARM
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_REL
 	select NEED_DMA_MAP_STATE
-	select NO_BOOTMEM
 	select OF_EARLY_FLATTREE if OF
 	select OF_RESERVED_MEM if OF
 	select OLD_SIGACTION
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 964f682a2b7b..a8f36c7041ff 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -161,7 +161,6 @@ config ARM64
 	select MULTI_IRQ_HANDLER
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 0a0558567eaa..46966f576249 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -39,7 +39,6 @@ config CSKY
 	select HAVE_MEMBLOCK
 	select MAY_HAVE_SPARSE_IRQ
 	select MODULES_USE_ELF_RELA if MODULES
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 0b334b671e90..5e89d40be8cd 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -16,7 +16,6 @@ config H8300
 	select OF_IRQ
 	select OF_EARLY_FLATTREE
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select TIMER_OF
 	select H8300_TMR8
 	select HAVE_KERNEL_GZIP
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 7b25d7c8fa49..7823f15e17b2 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -23,7 +23,6 @@ config HEXAGON
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 	select NEED_SG_DMA_LENGTH
 	select NO_IOPORT_MAP
 	select GENERIC_IOMAP
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 8b4a0c1748c0..2bf4ef792f2c 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -28,7 +28,6 @@ config IA64
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
-	select NO_BOOTMEM
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select ARCH_HAS_DMA_MARK_CLEAN
 	select ARCH_HAS_SG_CHAIN
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index c7b2a8d60a41..26edf2542295 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -29,7 +29,6 @@ config M68K
 	select DMA_DIRECT_OPS if HAS_DMA
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 
 config CPU_BIG_ENDIAN
 	def_bool y
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 164a4857737a..5c2777bb5555 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -28,7 +28,6 @@ config MICROBLAZE
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
-	select NO_BOOTMEM
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_OPROFILE
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 80778b40f8fa..366934157632 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -78,7 +78,6 @@ config MIPS
 	select RTC_LIB
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
-	select NO_BOOTMEM
 
 menu "Machine selection"
 
diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index 56992330026a..93c0b587ee23 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -36,7 +36,6 @@ config NDS32
 	select MODULES_USE_ELF_RELA
 	select OF
 	select OF_EARLY_FLATTREE
-	select NO_BOOTMEM
 	select NO_IOPORT_MAP
 	select RTC_LIB
 	select THREAD_INFO_IN_TASK
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 2df0c57f2833..b01febeb5ce3 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -25,7 +25,6 @@ config NIOS2
 	select CPU_NO_EFFICIENT_FFS
 	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
-	select NO_BOOTMEM
 
 config GENERIC_CSUM
 	def_bool y
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index a655ae280637..cbfaf15f9d70 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -32,7 +32,6 @@ config OPENRISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select OR1K_PIC
 	select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
-	select NO_BOOTMEM
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select ARCH_USE_QUEUED_RWLOCKS
 	select OMPIC if SMP
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index f1cd12afd943..7418ebeeb4a4 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -16,7 +16,6 @@ config PARISC
 	select RTC_DRV_GENERIC
 	select INIT_ALL_POSSIBLE
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select BUG
 	select BUILDTIME_EXTABLE_SORT
 	select HAVE_PERF_EVENTS
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e84943d24e5c..5798ffb1379b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -231,7 +231,6 @@ config PPC
 	select MODULES_USE_ELF_RELA
 	select NEED_DMA_MAP_STATE		if PPC64 || NOT_COHERENT_CACHE
 	select NEED_SG_DMA_LENGTH
-	select NO_BOOTMEM
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index fe451348ae57..f7c6b7cf124a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -35,7 +35,6 @@ config RISCV
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_PERF_EVENTS
 	select IRQ_DOMAIN
-	select NO_BOOTMEM
 	select RISCV_ISA_A if SMP
 	select SPARSE_IRQ
 	select SYSCTL_EXCEPTION_TRACE
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8b25e1f45b27..c7af83a15b2d 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -175,7 +175,6 @@ config S390
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select OLD_SIGACTION
 	select OLD_SIGSUSPEND3
 	select SPARSE_IRQ
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 475d786a65b0..7aaea9690e18 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -11,7 +11,6 @@ config SUPERH
 	select HAVE_IDE if HAS_IOPORT_MAP
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
-	select NO_BOOTMEM
 	select ARCH_DISCARD_MEMBLOCK
 	select HAVE_OPROFILE
 	select HAVE_GENERIC_DMA_COHERENT
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 7e2aa59fcc29..98c0996f3c2c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -46,7 +46,6 @@ config SPARC
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 
 config SPARC32
 	def_bool !64BIT
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 10c15b8853ae..ce3d56299b28 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -13,7 +13,6 @@ config UML
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select GENERIC_IRQ_SHOW
 	select GENERIC_CPU_DEVICES
 	select GENERIC_CLOCKEVENTS
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 0c5111b206bd..3a3b40f79558 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -6,7 +6,6 @@ config UNICORE32
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select DMA_DIRECT_OPS
 	select HAVE_MEMBLOCK
-	select NO_BOOTMEM
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ffebfc3f43c1..0354f52ef30e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -834,9 +834,6 @@ config JAILHOUSE_GUEST
 
 endif #HYPERVISOR_GUEST
 
-config NO_BOOTMEM
-	def_bool y
-
 source "arch/x86/Kconfig.cpu"
 
 config HPET_TIMER
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index ea5d8d03e53b..df43d2e76842 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -34,7 +34,6 @@ config XTENSA
 	select HAVE_STACKPROTECTOR
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
-	select NO_BOOTMEM
 	select PERF_USE_VMALLOC
 	select VIRT_TO_BUS
 	help
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 42515195d7d8..1f005b5c1555 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -26,34 +26,6 @@ extern unsigned long max_pfn;
  */
 extern unsigned long long max_possible_pfn;
 
-#ifndef CONFIG_NO_BOOTMEM
-/**
- * struct bootmem_data - per-node information used by the bootmem allocator
- * @node_min_pfn: the starting physical address of the node's memory
- * @node_low_pfn: the end physical address of the directly addressable memory
- * @node_bootmem_map: is a bitmap pointer - the bits represent all physical
- *		      memory pages (including holes) on the node.
- * @last_end_off: the offset within the page of the end of the last allocation;
- *                if 0, the page used is full
- * @hint_idx: the PFN of the page used with the last allocation;
- *            together with using this with the @last_end_offset field,
- *            a test can be made to see if allocations can be merged
- *            with the page used for the last allocation rather than
- *            using up a full new page.
- * @list: list entry in the linked list ordered by the memory addresses
- */
-typedef struct bootmem_data {
-	unsigned long node_min_pfn;
-	unsigned long node_low_pfn;
-	void *node_bootmem_map;
-	unsigned long last_end_off;
-	unsigned long hint_idx;
-	struct list_head list;
-} bootmem_data_t;
-
-extern bootmem_data_t bootmem_node_data[];
-#endif
-
 extern unsigned long bootmem_bootmap_pages(unsigned long);
 
 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
@@ -125,12 +97,8 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 				      unsigned long align,
 				      unsigned long goal) __malloc;
 
-#ifdef CONFIG_NO_BOOTMEM
 /* We are using top down, so it is safe to use 0 here */
 #define BOOTMEM_LOW_LIMIT 0
-#else
-#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
-#endif
 
 #ifndef ARCH_LOW_ADDRESS_LIMIT
 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
@@ -165,7 +133,7 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 	__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 
 
-#if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)
+#if defined(CONFIG_HAVE_MEMBLOCK)
 
 /* FIXME: use MEMBLOCK_ALLOC_* variants here */
 #define BOOTMEM_ALLOC_ACCESSIBLE	0
@@ -373,7 +341,7 @@ static inline void __init memblock_free_late(
 {
 	free_bootmem_late(base, size);
 }
-#endif /* defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM) */
+#endif /* defined(CONFIG_HAVE_MEMBLOCK) */
 
 extern void *alloc_large_system_hash(const char *tablename,
 				     unsigned long bucketsize,
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9f0caccd5833..847705a6d0ec 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -633,9 +633,6 @@ typedef struct pglist_data {
 	struct page_ext *node_page_ext;
 #endif
 #endif
-#ifndef CONFIG_NO_BOOTMEM
-	struct bootmem_data *bdata;
-#endif
 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
 	/*
 	 * Must be held any time you expect node_start_pfn, node_present_pages
@@ -869,7 +866,7 @@ static inline int is_highmem_idx(enum zone_type idx)
 }
 
 /**
- * is_highmem - helper function to quickly check if a struct zone is a 
+ * is_highmem - helper function to quickly check if a struct zone is a
  *              highmem zone or not.  This is an attempt to keep references
  *              to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum.
  * @zone - pointer to struct zone variable
diff --git a/mm/Kconfig b/mm/Kconfig
index 02301a89089e..f7cb608f9ab2 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -142,9 +142,6 @@ config HAVE_GENERIC_GUP
 config ARCH_DISCARD_MEMBLOCK
 	bool
 
-config NO_BOOTMEM
-	bool
-
 config MEMORY_ISOLATION
 	bool
 
@@ -634,7 +631,6 @@ config MAX_STACK_SIZE_MB
 config DEFERRED_STRUCT_PAGE_INIT
 	bool "Defer initialisation of struct pages to kthreads"
 	default n
-	depends on NO_BOOTMEM
 	depends on SPARSEMEM
 	depends on !NEED_PER_CPU_KM
 	depends on 64BIT
diff --git a/mm/Makefile b/mm/Makefile
index 6485d5745dd7..ea5333886593 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -42,12 +42,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 			   debug.o $(mmu-y)
 
 obj-y += init-mm.o
-
-ifdef CONFIG_NO_BOOTMEM
-	obj-y		+= nobootmem.o
-else
-	obj-y		+= bootmem.o
-endif
+obj-y += nobootmem.o
 
 ifdef CONFIG_MMU
 	obj-$(CONFIG_ADVISE_SYSCALLS)	+= madvise.o
diff --git a/mm/memblock.c b/mm/memblock.c
index a85315083b5a..d6897fbe021f 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1318,7 +1318,6 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
 	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
 }
 
-#if defined(CONFIG_NO_BOOTMEM)
 /**
  * memblock_virt_alloc_internal - allocate boot memory block
  * @size: size of memory block to be allocated in bytes
@@ -1524,7 +1523,6 @@ void * __init memblock_virt_alloc_try_nid(
 	      __func__, (u64)size, (u64)align, nid, &min_addr, &max_addr);
 	return NULL;
 }
-#endif
 
 /**
  * __memblock_free_early - free boot memory block