2018-01-15 14:26:15 +03:00
|
|
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
2018-01-06 17:13:39 +03:00
|
|
|
From: Peter Zijlstra <peterz@infradead.org>
|
|
|
|
|
Date: Tue, 5 Dec 2017 13:34:46 +0100
|
2018-01-15 14:26:15 +03:00
|
|
|
Subject: [PATCH] x86/mm: Remove superfluous barriers
|
2018-01-06 17:13:39 +03:00
|
|
|
MIME-Version: 1.0
|
|
|
|
|
Content-Type: text/plain; charset=UTF-8
|
|
|
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
|
|
|
|
|
|
CVE-2017-5754
|
|
|
|
|
|
|
|
|
|
atomic64_inc_return() already implies smp_mb() before and after.
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
|
|
|
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
|
Cc: Andy Lutomirski <luto@kernel.org>
|
|
|
|
|
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
|
|
|
Cc: Borislav Petkov <bp@alien8.de>
|
|
|
|
|
Cc: Brian Gerst <brgerst@gmail.com>
|
|
|
|
|
Cc: Dave Hansen <dave.hansen@linux.intel.com>
|
|
|
|
|
Cc: David Laight <David.Laight@aculab.com>
|
|
|
|
|
Cc: Denys Vlasenko <dvlasenk@redhat.com>
|
|
|
|
|
Cc: Eduardo Valentin <eduval@amazon.com>
|
|
|
|
|
Cc: Greg KH <gregkh@linuxfoundation.org>
|
|
|
|
|
Cc: H. Peter Anvin <hpa@zytor.com>
|
|
|
|
|
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
|
|
|
Cc: Juergen Gross <jgross@suse.com>
|
|
|
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
|
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
|
|
|
Cc: Will Deacon <will.deacon@arm.com>
|
|
|
|
|
Cc: aliguori@amazon.com
|
|
|
|
|
Cc: daniel.gruss@iaik.tugraz.at
|
|
|
|
|
Cc: hughd@google.com
|
|
|
|
|
Cc: keescook@google.com
|
|
|
|
|
Cc: linux-mm@kvack.org
|
|
|
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
|
|
|
(cherry picked from commit b5fc6d943808b570bdfbec80f40c6b3855f1c48b)
|
|
|
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
|
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
|
|
|
(cherry picked from commit 31a37930df33315a7006b46706f6babdb57db1f4)
|
|
|
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
|
|
|
---
|
|
|
|
|
arch/x86/include/asm/tlbflush.h | 8 +-------
|
|
|
|
|
1 file changed, 1 insertion(+), 7 deletions(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
|
|
|
|
|
index 6d2688a6fda0..bc1460b4737b 100644
|
|
|
|
|
--- a/arch/x86/include/asm/tlbflush.h
|
|
|
|
|
+++ b/arch/x86/include/asm/tlbflush.h
|
|
|
|
|
@@ -59,19 +59,13 @@ static inline void invpcid_flush_all_nonglobals(void)
|
|
|
|
|
|
|
|
|
|
static inline u64 inc_mm_tlb_gen(struct mm_struct *mm)
|
|
|
|
|
{
|
|
|
|
|
- u64 new_tlb_gen;
|
|
|
|
|
-
|
|
|
|
|
/*
|
|
|
|
|
* Bump the generation count. This also serves as a full barrier
|
|
|
|
|
* that synchronizes with switch_mm(): callers are required to order
|
|
|
|
|
* their read of mm_cpumask after their writes to the paging
|
|
|
|
|
* structures.
|
|
|
|
|
*/
|
|
|
|
|
- smp_mb__before_atomic();
|
|
|
|
|
- new_tlb_gen = atomic64_inc_return(&mm->context.tlb_gen);
|
|
|
|
|
- smp_mb__after_atomic();
|
|
|
|
|
-
|
|
|
|
|
- return new_tlb_gen;
|
|
|
|
|
+ return atomic64_inc_return(&mm->context.tlb_gen);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
|
|
|
--
|
|
|
|
|
2.14.2
|
|
|
|
|
|
