Messages in this thread Patch in this message | | | Date | Wed, 4 Jan 2012 07:32:28 -0800 | From | tip-bot for Eric Dumazet <> | Subject | [tip:x86/asm] x86: Fix atomic64_xxx_cx8() functions |
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Commit-ID: ceb7b40b65539a771d1bfaf47660ac0ee57e0c4f Gitweb: http://git.kernel.org/tip/ceb7b40b65539a771d1bfaf47660ac0ee57e0c4f Author: Eric Dumazet <eric.dumazet@gmail.com> AuthorDate: Tue, 3 Jan 2012 17:35:40 +0100 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Wed, 4 Jan 2012 15:01:56 +0100
x86: Fix atomic64_xxx_cx8() functions
It appears about all functions in arch/x86/lib/atomic64_cx8_32.S are wrong in case cmpxchg8b must be restarted, because LOCK_PREFIX macro defines a label "1" clashing with other local labels :
1: some_instructions LOCK_PREFIX cmpxchg8b (%ebp) jne 1b / jumps to beginning of LOCK_PREFIX !
A possible fix is to use a magic label "672" in LOCK_PREFIX asm definition, similar to the "671" one we defined in LOCK_PREFIX_HERE.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Jan Beulich <JBeulich@suse.com> Cc: Christoph Lameter <cl@linux.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/1325608540.2320.103.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC Signed-off-by: Ingo Molnar <mingo@elte.hu> --- arch/x86/include/asm/alternative-asm.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h index 091508b..952bd01 100644 --- a/arch/x86/include/asm/alternative-asm.h +++ b/arch/x86/include/asm/alternative-asm.h @@ -4,10 +4,10 @@ #ifdef CONFIG_SMP .macro LOCK_PREFIX -1: lock +672: lock .section .smp_locks,"a" .balign 4 - .long 1b - . + .long 672b - . .previous .endm #else
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