diff options
author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 01:16:03 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:31 +0200 |
commit | 6dc25876cdb17fd3906504dcabb9e537f8433000 (patch) | |
tree | d8e5ae95f3be9fb0ab03f24738602a9859e1326e /lib | |
parent | a8bcccaba162632c3963259b8a442c6b490f4c68 (diff) |
locking/atomic, arch/xtensa: Implement atomic_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>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
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-xtensa@linux-xtensa.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions