Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Allocate the E820 buffer before doing the
     GetMemoryMap/ExitBootServices dance so we don't run out of space

   - Clear EFI boot services mappings when freeing the memory

   - Harden efivars against callers that invoke it on non-EFI boots

   - Reduce the number of memblock reservations resulting from extensive
     use of the new efi_mem_reserve_persistent() API

   - Other assorted fixes and cleanups"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/efi: Don't unmap EFI boot services code/data regions for EFI_OLD_MEMMAP and EFI_MIXED_MODE
  efi: Reduce the amount of memblock reservations for persistent allocations
  efi: Permit multiple entries in persistent memreserve data structure
  efi/libstub: Disable some warnings for x86{,_64}
  x86/efi: Move efi_<reserve/free>_boot_services() to arch/x86
  x86/efi: Unmap EFI boot services code/data regions from efi_pgd
  x86/mm/pageattr: Introduce helper function to unmap EFI boot services
  efi/fdt: Simplify the get_fdt() flow
  efi/fdt: Indentation fix
  firmware/efi: Add NULL pointer checks in efivars API functions

1 files changed, 13 insertions, 6 deletions

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 100ce4a4aff6..becd5d76a207 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1000,13 +1000,11 @@ extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg);
 extern void efi_gettimeofday (struct timespec64 *ts);
 extern void efi_enter_virtual_mode (void);	/* switch EFI to virtual mode, if possible */
 #ifdef CONFIG_X86
-extern void efi_free_boot_services(void);
 extern efi_status_t efi_query_variable_store(u32 attributes,
 					     unsigned long size,
 					     bool nonblocking);
 extern void efi_find_mirror(void);
 #else
-static inline void efi_free_boot_services(void) {}
 
 static inline efi_status_t efi_query_variable_store(u32 attributes,
 						    unsigned long size,
@@ -1046,7 +1044,6 @@ extern void efi_mem_reserve(phys_addr_t addr, u64 size);
 extern int efi_mem_reserve_persistent(phys_addr_t addr, u64 size);
 extern void efi_initialize_iomem_resources(struct resource *code_resource,
 		struct resource *data_resource, struct resource *bss_resource);
-extern void efi_reserve_boot_services(void);
 extern int efi_get_fdt_params(struct efi_fdt_params *params);
 extern struct kobject *efi_kobj;
 
@@ -1715,9 +1712,19 @@ extern struct efi_runtime_work efi_rts_work;
 extern struct workqueue_struct *efi_rts_wq;
 
 struct linux_efi_memreserve {
-	phys_addr_t	next;
-	phys_addr_t	base;
-	phys_addr_t	size;
+	int		size;			// allocated size of the array
+	atomic_t	count;			// number of entries used
+	phys_addr_t	next;			// pa of next struct instance
+	struct {
+		phys_addr_t	base;
+		phys_addr_t	size;
+	} entry[0];
 };
 
+#define EFI_MEMRESERVE_SIZE(count) (sizeof(struct linux_efi_memreserve) + \
+	(count) * sizeof(((struct linux_efi_memreserve *)0)->entry[0]))
+
+#define EFI_MEMRESERVE_COUNT(size) (((size) - sizeof(struct linux_efi_memreserve)) \
+	/ sizeof(((struct linux_efi_memreserve *)0)->entry[0]))
+
 #endif /* _LINUX_EFI_H */