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authorPeter Zijlstra <peterz@infradead.org>2016-04-18 01:16:08 +0200
committerIngo Molnar <mingo@kernel.org>2016-06-16 10:48:23 +0200
commite87fc0ec070554e34812be68267a9450271868d6 (patch)
treed99ccf1052722bd4e699414851673768f4004e8f /arch/frv
parent1a6eafacd4811cdc1b138faee858527658eee4e1 (diff)
downloadlwn-e87fc0ec070554e34812be68267a9450271868d6.tar.gz
lwn-e87fc0ec070554e34812be68267a9450271868d6.zip
locking/atomic, arch/blackfin: 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: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Miao <realmz6@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: adi-buildroot-devel@lists.sourceforge.net Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/frv')
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