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author | Peter Zijlstra <peterz@infradead.org> | 2016-04-17 23:16:05 (GMT) |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 08:48:29 (GMT) |
commit | 56fefbbc3f13ad8cc9f502dbc6b5c9ddc8c4395e (patch) | |
tree | 4643604e72c1ce99d08bc083a9120ee703804d1e /arch/sh | |
parent | a28cc7bbe8e30ee573e1a27e704558f0862d8c6d (diff) | |
download | linux-56fefbbc3f13ad8cc9f502dbc6b5c9ddc8c4395e.tar.xz |
locking/atomic, arch/s390: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
Implement FETCH-OP atomic primitives, these are very similar to the
existing OP-RETURN primitives we already have, except they return the
value of the atomic variable _before_ modification.
This is especially useful for irreversible operations -- such as
bitops (because it becomes impossible to reconstruct the state prior
to modification).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sh')
0 files changed, 0 insertions, 0 deletions