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| author | Peter Zijlstra <peterz@infradead.org> | 2016-04-18 00:54:38 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-16 10:48:32 +0200 |
| commit | 28aa2bda2211f4327d83b44a4f917b4a061b1c56 (patch) | |
| tree | e47ab8a7c49f19bd42722dcc2b8cf083e08cf270 /lib/atomic64.c | |
| parent | e12133324b7daaa176bb687c1eb59e1a6b203da4 (diff) | |
| download | linux-28aa2bda2211f4327d83b44a4f917b4a061b1c56.tar.bz2 | |
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
Now that all the architectures have implemented support for these new
atomic primitives add on the generic infrastructure to expose and use
it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Frederic Weisbecker <fweisbec@gmail.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: Will Deacon <will.deacon@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/atomic64.c')
| -rw-r--r-- | lib/atomic64.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/lib/atomic64.c b/lib/atomic64.c index 2886ebac6567..53c2d5edc826 100644 --- a/lib/atomic64.c +++ b/lib/atomic64.c @@ -96,17 +96,41 @@ long long atomic64_##op##_return(long long a, atomic64_t *v) \ } \ EXPORT_SYMBOL(atomic64_##op##_return); +#define ATOMIC64_FETCH_OP(op, c_op) \ +long long atomic64_fetch_##op(long long a, atomic64_t *v) \ +{ \ + unsigned long flags; \ + raw_spinlock_t *lock = lock_addr(v); \ + long long val; \ + \ + raw_spin_lock_irqsave(lock, flags); \ + val = v->counter; \ + v->counter c_op a; \ + raw_spin_unlock_irqrestore(lock, flags); \ + return val; \ +} \ +EXPORT_SYMBOL(atomic64_fetch_##op); + #define ATOMIC64_OPS(op, c_op) \ ATOMIC64_OP(op, c_op) \ - ATOMIC64_OP_RETURN(op, c_op) + ATOMIC64_OP_RETURN(op, c_op) \ + ATOMIC64_FETCH_OP(op, c_op) ATOMIC64_OPS(add, +=) ATOMIC64_OPS(sub, -=) -ATOMIC64_OP(and, &=) -ATOMIC64_OP(or, |=) -ATOMIC64_OP(xor, ^=) #undef ATOMIC64_OPS +#define ATOMIC64_OPS(op, c_op) \ + ATOMIC64_OP(op, c_op) \ + ATOMIC64_OP_RETURN(op, c_op) \ + ATOMIC64_FETCH_OP(op, c_op) + +ATOMIC64_OPS(and, &=) +ATOMIC64_OPS(or, |=) +ATOMIC64_OPS(xor, ^=) + +#undef ATOMIC64_OPS +#undef ATOMIC64_FETCH_OP #undef ATOMIC64_OP_RETURN #undef ATOMIC64_OP |