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authorPeter Zijlstra <peterz@infradead.org>2016-04-17 23:10:52 (GMT)
committerIngo Molnar <mingo@kernel.org>2016-06-16 08:48:20 (GMT)
commit6da068c1beba684b2a0dbf43a07b0529edd9e959 (patch)
treedcc2b7f55837ea2981ba460f3cc7de2f5ec379eb /fs
parentfbffe892e5253dd02c016c59a9d792eafe9d53e1 (diff)
downloadlinux-6da068c1beba684b2a0dbf43a07b0529edd9e959.tar.xz
locking/atomic, arch/arm: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
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: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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