From: Michael S. Tsirkin <mst@redhat.com>
Date: Sun, 24 Jun 2012 16:24:42 +0000 (+0300)
Subject: x86, bitops: note on __test_and_clear_bit atomicity
X-Git-Tag: v3.6-rc1~124^2~59
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0a69d6321ca759bb8d47803d06ba8571ab42d07;p=pandora-kernel.git

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>
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