linux-kernel - [tip:x86/mm] x86/mm: Allow userspace have mappings above 47-bit

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Message-ID: <tip-ee00f4a32a76ef631394f31d5b6028d50462b357@git.kernel.org>
Date:   Fri, 21 Jul 2017 02:40:51 -0700
From:   "tip-bot for Kirill A. Shutemov" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     kirill.shutemov@...ux.intel.com, mingo@...nel.org,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        dave.hansen@...el.com, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de,
        luto@...capital.net
Subject: [tip:x86/mm] x86/mm: Allow userspace have mappings above 47-bit

Commit-ID:  ee00f4a32a76ef631394f31d5b6028d50462b357
Gitweb:     http://git.kernel.org/tip/ee00f4a32a76ef631394f31d5b6028d50462b357
Author:     Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
AuthorDate: Mon, 17 Jul 2017 01:59:53 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 21 Jul 2017 10:05:19 +0200

x86/mm: Allow userspace have mappings above 47-bit

All bits and pieces are now in place and we can allow userspace to have VMAs
above 47 bits.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-arch@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/20170716225954.74185-8-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/processor.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 58fd40a3..ed26e14 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -850,9 +850,9 @@ static inline void spin_lock_prefetch(const void *x)
  * particular problem by preventing anything from being mapped
  * at the maximum canonical address.
  */
-#define TASK_SIZE_MAX	((1UL << 47) - PAGE_SIZE)
+#define TASK_SIZE_MAX	((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
 
-#define DEFAULT_MAP_WINDOW	TASK_SIZE_MAX
+#define DEFAULT_MAP_WINDOW	((1UL << 47) - PAGE_SIZE)
 
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.