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| author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 01:16:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:30 +0200 |
| commit | 1af5de9af138941fb8638cf126293b16f3387de4 (patch) | |
| tree | 55b1f10f549b59c7e6442505905496a9e822ce36 /arch/tile/include/asm/atomic.h | |
| parent | 3a1adb23a52c920304239efff377d3bc967febc2 (diff) | |
| download | linux-1af5de9af138941fb8638cf126293b16f3387de4.tar.bz2 | |
locking/atomic, arch/tile: 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>
Acked-by: Chris Metcalf <cmetcalf@mellanox.com>
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 'arch/tile/include/asm/atomic.h')
| -rw-r--r-- | arch/tile/include/asm/atomic.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h index 9fc0107a9c5e..9807030557c4 100644 --- a/arch/tile/include/asm/atomic.h +++ b/arch/tile/include/asm/atomic.h @@ -46,6 +46,10 @@ static inline int atomic_read(const atomic_t *v) */ #define atomic_sub_return(i, v) atomic_add_return((int)(-(i)), (v)) +#define atomic_fetch_sub(i, v) atomic_fetch_add(-(int)(i), (v)) + +#define atomic_fetch_or atomic_fetch_or + /** * atomic_sub - subtract integer from atomic variable * @i: integer value to subtract |