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authorPeter Zijlstra <peterz@infradead.org>2016-04-18 02:16:03 +0300
committerIngo Molnar <mingo@kernel.org>2016-06-16 11:48:31 +0300
commita8bcccaba162632c3963259b8a442c6b490f4c68 (patch)
treed44f5e4ab5ff4f56e444352a18fd00716a69a7af /arch/xtensa
parent1af5de9af138941fb8638cf126293b16f3387de4 (diff)
downloadlinux-a8bcccaba162632c3963259b8a442c6b490f4c68.tar.xz
locking/atomic, arch/x86: 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> Cc: Andrew Morton <akpm@linux-foundation.org> 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 Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/xtensa')
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