kcopyd use mutex instead of semaphore
Kcopyd uses a semaphore as mutex. Use the mutex API instead of the (binary) semaphore, Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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