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authorPeter Zijlstra <peterz@infradead.org>2016-04-18 01:16:08 +0200
committerIngo Molnar <mingo@kernel.org>2016-06-16 10:48:24 +0200
commit0c074cbc33091dd69fe70ec27474d228c3184860 (patch)
tree24f529cc54a3133c84aa96d3d325cb983c89cdf4 /arch/hexagon
parentd9c730281617e55ca470e66f8e9d7d3f5f420fec (diff)
downloadop-kernel-dev-0c074cbc33091dd69fe70ec27474d228c3184860.zip
op-kernel-dev-0c074cbc33091dd69fe70ec27474d228c3184860.tar.gz
locking/atomic, arch/h8300: 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: Thomas Gleixner <tglx@linutronix.de> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: uclinux-h8-devel@lists.sourceforge.jp Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/hexagon')
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