From: "tip-bot for Kirill A. Shutemov" <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: torvalds@linux-foundation.org, mingo@kernel.org,
linux-kernel@vger.kernel.org, bp@suse.de, peterz@infradead.org,
tglx@linutronix.de, luto@amacapital.net,
kirill.shutemov@linux.intel.com, hpa@zytor.com
Subject: [tip:x86/mm] x86/mm/64: Make __PHYSICAL_MASK_SHIFT always 52
Date: Wed, 14 Feb 2018 05:04:20 -0800 [thread overview]
Message-ID: <tip-b83ce5ee91471d19c403ff91227204fb37c95fb2@git.kernel.org> (raw)
In-Reply-To: <20180214111656.88514-2-kirill.shutemov@linux.intel.com>
Commit-ID: b83ce5ee91471d19c403ff91227204fb37c95fb2
Gitweb: https://git.kernel.org/tip/b83ce5ee91471d19c403ff91227204fb37c95fb2
Author: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate: Wed, 14 Feb 2018 14:16:48 +0300
Committer: Ingo Molnar <mingo@kernel.org>
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@linux.intel.com>
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: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-2-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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
next prev parent reply other threads:[~2018-02-14 13:14 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-14 11:16 [PATCH 0/9] x86/mm: Dynamic memory layout Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 1/9] x86/mm/64: Make __PHYSICAL_MASK_SHIFT always 52 Kirill A. Shutemov
2018-02-14 13:04 ` tip-bot for Kirill A. Shutemov [this message]
2018-02-14 11:16 ` [PATCH 2/9] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS Kirill A. Shutemov
2018-02-14 13:04 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 3/9] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2018-02-14 13:05 ` [tip:x86/mm] x86/mm: Make virtual memory layout dynamic for CONFIG_X86_5LEVEL=y tip-bot for Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 4/9] x86: Introduce pgtable_l5_enabled Kirill A. Shutemov
2018-02-14 13:05 ` [tip:x86/mm] x86/mm: Introduce 'pgtable_l5_enabled' tip-bot for Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 5/9] x86/mm: Make LDT_BASE_ADDR dynamic Kirill A. Shutemov
2018-02-14 13:06 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-14 13:32 ` [PATCH 5/9] " Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 6/9] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2018-02-14 13:06 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 7/9] x86/mm: Make MAX_PHYSADDR_BITS and MAX_PHYSMEM_BITS dynamic Kirill A. Shutemov
2018-02-14 13:07 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 8/9] x86/mm: Make __VIRTUAL_MASK_SHIFT dynamic Kirill A. Shutemov
2018-02-14 13:07 ` [tip:x86/mm] " tip-bot for Kirill A. Shutemov
2018-02-14 17:22 ` [PATCH 8/9] " Andy Lutomirski
2018-02-14 17:55 ` Kirill A. Shutemov
2018-02-14 18:02 ` Andy Lutomirski
2018-02-14 11:16 ` [PATCH 9/9] x86/mm: Adjust virtual address space layout in early boot Kirill A. Shutemov
2018-02-14 12:10 ` Ingo Molnar
2018-02-14 12:19 ` Kirill A. Shutemov
2018-02-14 12:26 ` Ingo Molnar
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