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locking,arch,sparc: Fold atomic_ops

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Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kirill Tkhai <tkhai@yandex.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: sparclinux@vger.kernel.org
Link: http://lkml.kernel.org/r/20140508135852.825281379@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2014-03-26 18:29:28 +01:00 • committed by Ingo Molnar
commit 4f3316c2b5
6 changed files with 131 additions and 146 deletions
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25
arch/sparc/lib/atomic32.c
View file

@ -27,18 +27,23 @@ static DEFINE_SPINLOCK(dummy);
#endif /* SMP */
int __atomic_add_return(int i, atomic_t *v)
{
int ret;
unsigned long flags;
spin_lock_irqsave(ATOMIC_HASH(v), flags);
#define ATOMIC_OP(op, cop) \
int atomic_##op##_return(int i, atomic_t *v) \
{ \
int ret; \
unsigned long flags; \
spin_lock_irqsave(ATOMIC_HASH(v), flags); \
\
ret = (v->counter cop i); \
\
spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
return ret; \
} \
EXPORT_SYMBOL(atomic_##op##_return);
ret = (v->counter += i);
ATOMIC_OP(add, +=)
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
return ret;
}
EXPORT_SYMBOL(__atomic_add_return);
#undef ATOMIC_OP
int atomic_cmpxchg(atomic_t *v, int old, int new)
{