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| author | Peter Zijlstra <peterz@infradead.org> | 2017-12-05 13:34:46 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-12-22 20:13:03 +0100 |
| commit | b5fc6d943808b570bdfbec80f40c6b3855f1c48b (patch) | |
| tree | 2e6ddbeb5ad7a205c6c97c8ba0ca877051187ddb | |
| parent | a501686b2923ce6f2ff2b1d0d50682c6411baf72 (diff) | |
| download | linux-b5fc6d943808b570bdfbec80f40c6b3855f1c48b.tar.gz linux-b5fc6d943808b570bdfbec80f40c6b3855f1c48b.tar.bz2 linux-b5fc6d943808b570bdfbec80f40c6b3855f1c48b.zip | |
x86/mm: Remove superfluous barriers
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>
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index c2e45da4e540..3e2227386abe 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -60,19 +60,13 @@ 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 |