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| author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 01:16:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:30 +0200 |
| commit | 3a1adb23a52c920304239efff377d3bc967febc2 (patch) | |
| tree | 63383d193b7a7adaec40939daac2cdd22326108a /arch/sparc/include/asm/atomic_32.h | |
| parent | 7d9794e7523798e1b9422ad9f4e4d808ae5d5932 (diff) | |
| download | linux-3a1adb23a52c920304239efff377d3bc967febc2.tar.gz linux-3a1adb23a52c920304239efff377d3bc967febc2.tar.bz2 linux-3a1adb23a52c920304239efff377d3bc967febc2.zip | |
locking/atomic, arch/sparc: 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: David S. Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: James Y Knight <jyknight@google.com>
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
Cc: sparclinux@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sparc/include/asm/atomic_32.h')
| -rw-r--r-- | arch/sparc/include/asm/atomic_32.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/sparc/include/asm/atomic_32.h b/arch/sparc/include/asm/atomic_32.h index 7dcbebbcaec6..5cfb20a599d9 100644 --- a/arch/sparc/include/asm/atomic_32.h +++ b/arch/sparc/include/asm/atomic_32.h @@ -20,9 +20,10 @@ #define ATOMIC_INIT(i) { (i) } int atomic_add_return(int, atomic_t *); -void atomic_and(int, atomic_t *); -void atomic_or(int, atomic_t *); -void atomic_xor(int, atomic_t *); +int atomic_fetch_add(int, atomic_t *); +int atomic_fetch_and(int, atomic_t *); +int atomic_fetch_or(int, atomic_t *); +int atomic_fetch_xor(int, atomic_t *); int atomic_cmpxchg(atomic_t *, int, int); int atomic_xchg(atomic_t *, int); int __atomic_add_unless(atomic_t *, int, int); @@ -35,7 +36,15 @@ void atomic_set(atomic_t *, int); #define atomic_inc(v) ((void)atomic_add_return( 1, (v))) #define atomic_dec(v) ((void)atomic_add_return( -1, (v))) +#define atomic_fetch_or atomic_fetch_or + +#define atomic_and(i, v) ((void)atomic_fetch_and((i), (v))) +#define atomic_or(i, v) ((void)atomic_fetch_or((i), (v))) +#define atomic_xor(i, v) ((void)atomic_fetch_xor((i), (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_inc_return(v) (atomic_add_return( 1, (v))) #define atomic_dec_return(v) (atomic_add_return( -1, (v))) |