ceb7b40b65
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>
27 lines
382 B
C
27 lines
382 B
C
#ifdef __ASSEMBLY__
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#include <asm/asm.h>
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#ifdef CONFIG_SMP
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.macro LOCK_PREFIX
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672: lock
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.section .smp_locks,"a"
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.balign 4
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.long 672b - .
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.previous
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.endm
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#else
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.macro LOCK_PREFIX
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.endm
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#endif
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.macro altinstruction_entry orig alt feature orig_len alt_len
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.long \orig - .
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.long \alt - .
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.word \feature
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.byte \orig_len
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.byte \alt_len
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.endm
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#endif /* __ASSEMBLY__ */
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