tree ab898dc907aa2a93f39ec00117649bde2dd27e0a
parent 9f02cfc84b85929947b32fe1674fbc6a429f332a
author Stefan Hajnoczi <stefanha@redhat.com> 1417519395 +0000
committer Paolo Bonzini <pbonzini@redhat.com> 1433517000 +0200

bitmap: add atomic test and clear

The new bitmap_test_and_clear_atomic() function clears a range and
returns whether or not the bits were set.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <1417519399-3166-3-git-send-email-stefanha@redhat.com>
[Test before xchg; then a full barrier is needed at the end just like
 in the previous patch.  The barrier can be avoided if we did at least
 one xchg.  - Paolo]
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>