Messages in this thread Patch in this message | | | Subject | [PATCH] x86: fix atomic64_xxx_cx8() functions | From | Eric Dumazet <> | Date | Tue, 03 Jan 2012 17:35:40 +0100 |
| |
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: Ingo Molnar <mingo@elte.hu> CC: H. Peter Anvin <hpa@zytor.com> Cc: stable@vger.kernel.org [2.6.35+] --- arch/x86/include/asm/alternative-asm.h | 4 ++-- 1 file 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
| |