Commit-ID: b83ce5ee91471d19c403ff91227204fb37c95fb2 Gitweb: https://git.kernel.org/tip/b83ce5ee91471d19c403ff91227204fb37c95fb2 Author: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> AuthorDate: Wed, 14 Feb 2018 14:16:48 +0300 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 14 Feb 2018 13:11:13 +0100 x86/mm/64: Make __PHYSICAL_MASK_SHIFT always 52 __PHYSICAL_MASK_SHIFT is used to define the mask that helps to extract physical address from a page table entry. Although real physical address space available may differ between machines, it's safe to use 52 as __PHYSICAL_MASK_SHIFT. Unused bits above log2(MAXPHYADDR) up to bit 51 are reserved and must be 0. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Link: http://lkml.kernel.org/r/20180214111656.88514-2-kirill.shutemov@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/include/asm/page_64_types.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h index e140731..f68e652 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -52,11 +52,12 @@ #define __START_KERNEL_map _AC(0xffffffff80000000, UL) /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */ -#ifdef CONFIG_X86_5LEVEL + #define __PHYSICAL_MASK_SHIFT 52 + +#ifdef CONFIG_X86_5LEVEL #define __VIRTUAL_MASK_SHIFT 56 #else -#define __PHYSICAL_MASK_SHIFT 46 #define __VIRTUAL_MASK_SHIFT 47 #endif -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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