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s390/rwlock: use the interlocked-access facility 1 instructions
authorMartin Schwidefsky <schwidefsky@de.ibm.com>
Mon, 22 Sep 2014 14:34:38 +0000 (16:34 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 25 Sep 2014 08:52:13 +0000 (10:52 +0200)
Make use of the load-and-add, load-and-or and load-and-and instructions
to atomically update the read-write lock without a compare-and-swap loop.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

No differences found
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