From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> commit 02390b87a9459937cdb299e6b34ff33992512ec7 upstream With boot-time switching between paging mode we will have variable MAX_PHYSMEM_BITS. Let's use the maximum variable possible for CONFIG_X86_5LEVEL=y configuration to define zsmalloc data structures. The patch introduces MAX_POSSIBLE_PHYSMEM_BITS to cover such case. It also suits well to handle PAE special case. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reviewed-by: Nitin Gupta <ngupta@xxxxxxxxxx> Acked-by: Minchan Kim <minchan@xxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Link: http://lkml.kernel.org/r/20180214111656.88514-3-kirill.shutemov@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/pgtable-3level_types.h | 1 + arch/x86/include/asm/pgtable_64_types.h | 2 ++ mm/zsmalloc.c | 13 +++++++------ 3 files changed, 10 insertions(+), 6 deletions(-) --- a/arch/x86/include/asm/pgtable-3level_types.h +++ b/arch/x86/include/asm/pgtable-3level_types.h @@ -44,5 +44,6 @@ typedef union { */ #define PTRS_PER_PTE 512 +#define MAX_POSSIBLE_PHYSMEM_BITS 36 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */ --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -40,6 +40,8 @@ typedef struct { pteval_t pte; } pte_t; #define P4D_SIZE (_AC(1, UL) << P4D_SHIFT) #define P4D_MASK (~(P4D_SIZE - 1)) +#define MAX_POSSIBLE_PHYSMEM_BITS 52 + #else /* CONFIG_X86_5LEVEL */ /* --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -83,18 +83,19 @@ * This is made more complicated by various memory models and PAE. */ -#ifndef MAX_PHYSMEM_BITS -#ifdef CONFIG_HIGHMEM64G -#define MAX_PHYSMEM_BITS 36 -#else /* !CONFIG_HIGHMEM64G */ +#ifndef MAX_POSSIBLE_PHYSMEM_BITS +#ifdef MAX_PHYSMEM_BITS +#define MAX_POSSIBLE_PHYSMEM_BITS MAX_PHYSMEM_BITS +#else /* * If this definition of MAX_PHYSMEM_BITS is used, OBJ_INDEX_BITS will just * be PAGE_SHIFT */ -#define MAX_PHYSMEM_BITS BITS_PER_LONG +#define MAX_POSSIBLE_PHYSMEM_BITS BITS_PER_LONG #endif #endif -#define _PFN_BITS (MAX_PHYSMEM_BITS - PAGE_SHIFT) + +#define _PFN_BITS (MAX_POSSIBLE_PHYSMEM_BITS - PAGE_SHIFT) /* * Memory for allocating for handle keeps object position by
