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author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 02:16:05 +0300 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 11:48:28 +0300 |
commit | a28cc7bbe8e30ee573e1a27e704558f0862d8c6d (patch) | |
tree | 6adf60c078e019687500e10bf7b09adc3b1b6877 /arch/sh/include/asm | |
parent | e5857a6ed6004cac5273b8cdc189ab4b6363cfaf (diff) | |
download | linux-a28cc7bbe8e30ee573e1a27e704558f0862d8c6d.tar.xz |
locking/atomic, arch/powerpc: Implement atomic{,64}_fetch_{add,sub,and,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).
Tested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
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: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sh/include/asm')
0 files changed, 0 insertions, 0 deletions