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| author |   Peter Zijlstra <peterz@infradead.org> | 2016-04-18 01:16:08 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:24 +0200 |
| commit | d9c730281617e55ca470e66f8e9d7d3f5f420fec (patch) | |
| tree | a71eb745513c5449838768b97f8cd57e7b2d0994 /arch/frv/include/asm/atomic_defs.h | |
| parent | locking/atomic, arch/blackfin: Implement atomic_fetch_{add,sub,and,or,xor}() (diff) | |
| download | linux-dev-d9c730281617e55ca470e66f8e9d7d3f5f420fec.tar.xz linux-dev-d9c730281617e55ca470e66f8e9d7d3f5f420fec.zip | |
locking/atomic, arch/frv: 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 '')
| -rw-r--r-- | arch/frv/include/asm/atomic_defs.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/frv/include/asm/atomic_defs.h b/arch/frv/include/asm/atomic_defs.h index 36e126d2f801..d4912c88b829 100644 --- a/arch/frv/include/asm/atomic_defs.h +++ b/arch/frv/include/asm/atomic_defs.h @@ -162,6 +162,8 @@ ATOMIC_EXPORT(__atomic64_fetch_##op); ATOMIC_FETCH_OP(or) ATOMIC_FETCH_OP(and) ATOMIC_FETCH_OP(xor) +ATOMIC_FETCH_OP(add) +ATOMIC_FETCH_OP(sub) ATOMIC_OP_RETURN(add) ATOMIC_OP_RETURN(sub) |