x86, bitops: note on __test_and_clear_bit atomicity

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__test_and_clear_bit is actually atomic with respect
to the local CPU. Add a note saying that KVM on x86
relies on this behaviour so people don't accidentaly break it.
Also warn not to rely on this in portable code.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Michael S. Tsirkin 2012-06-24 19:24:42 +03:00 • committed by Avi Kivity

parent ab9cf4996b

commit d0a69d6321

1 changed files with 7 additions and 0 deletions

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arch/x86/include/asm/bitops.h

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