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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/lib/ksyms.c | |
| parent | locking/atomic, arch/sh: Implement atomic_fetch_{add,sub,and,or,xor}() (diff) | |
| download | linux-dev-3a1adb23a52c920304239efff377d3bc967febc2.tar.xz linux-dev-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 '')
| -rw-r--r-- | arch/sparc/lib/ksyms.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/sparc/lib/ksyms.c b/arch/sparc/lib/ksyms.c index 8eb454cfe05c..de5e97817bdb 100644 --- a/arch/sparc/lib/ksyms.c +++ b/arch/sparc/lib/ksyms.c @@ -107,15 +107,24 @@ EXPORT_SYMBOL(atomic64_##op); EXPORT_SYMBOL(atomic_##op##_return); \ EXPORT_SYMBOL(atomic64_##op##_return); -#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) +#define ATOMIC_FETCH_OP(op) \ +EXPORT_SYMBOL(atomic_fetch_##op); \ +EXPORT_SYMBOL(atomic64_fetch_##op); + +#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) ATOMIC_OPS(add) ATOMIC_OPS(sub) -ATOMIC_OP(and) -ATOMIC_OP(or) -ATOMIC_OP(xor) #undef ATOMIC_OPS +#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) + +ATOMIC_OPS(and) +ATOMIC_OPS(or) +ATOMIC_OPS(xor) + +#undef ATOMIC_OPS +#undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP |