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| author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 02:16:04 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 11:48:29 +0300 |
| commit | 7d9794e7523798e1b9422ad9f4e4d808ae5d5932 (patch) | |
| tree | 3a1a550803485049b8e8c2a434c0c9107831f3a6 /arch/sh/include/asm/atomic.h | |
| parent | 56fefbbc3f13ad8cc9f502dbc6b5c9ddc8c4395e (diff) | |
| download | linux-7d9794e7523798e1b9422ad9f4e4d808ae5d5932.tar.xz | |
locking/atomic, arch/sh: 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: Rich Felker <dalias@libc.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: linux-sh@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sh/include/asm/atomic.h')
| -rw-r--r-- | arch/sh/include/asm/atomic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h index c399e1c55685..d93ed7ce1b2f 100644 --- a/arch/sh/include/asm/atomic.h +++ b/arch/sh/include/asm/atomic.h @@ -25,6 +25,8 @@ #include <asm/atomic-irq.h> #endif +#define atomic_fetch_or atomic_fetch_or + #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) #define atomic_dec_return(v) atomic_sub_return(1, (v)) #define atomic_inc_return(v) atomic_add_return(1, (v)) |