From: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com
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@linux.intel.com Reviewed-by: Nitin Gupta ngupta@vflare.org Acked-by: Minchan Kim minchan@kernel.org Cc: Andy Lutomirski luto@amacapital.net Cc: Borislav Petkov bp@suse.de Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Sergey Senozhatsky sergey.senozhatsky.work@gmail.com Cc: Thomas Gleixner tglx@linutronix.de Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180214111656.88514-3-kirill.shutemov@linux.intel.... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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