Michael S. Tsirkin d0a69d6321 x86, bitops: note on __test_and_clear_bit atomicity ...

__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>

2012-06-25 12:38:35 +03:00

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