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locking,arch: Rewrite generic atomic support

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Rewrite generic atomic support to only require cmpxchg(), generate all
other primitives from that.

Furthermore reduce the endless repetition for all these primitives to
a few CPP macros. This way we get more for less lines.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140508135852.940119622@infradead.org
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2014-04-23 16:12:30 +02:00
committed by Ingo Molnar
parent d4608dd5b4
commit 560cb12a40
3 changed files with 144 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files

75
lib/atomic64.c
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@@ -70,53 +70,42 @@ void atomic64_set(atomic64_t *v, long long i)
}
EXPORT_SYMBOL(atomic64_set);
void atomic64_add(long long a, atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
#define ATOMIC64_OP(op, c_op) \
void atomic64_##op(long long a, atomic64_t *v) \
{ \
unsigned long flags; \
raw_spinlock_t *lock = lock_addr(v); \
\
raw_spin_lock_irqsave(lock, flags); \
v->counter c_op a; \
raw_spin_unlock_irqrestore(lock, flags); \
} \
EXPORT_SYMBOL(atomic64_##op);
raw_spin_lock_irqsave(lock, flags);
v->counter += a;
raw_spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_add);
#define ATOMIC64_OP_RETURN(op, c_op) \
long long atomic64_##op##_return(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 c_op a); \
raw_spin_unlock_irqrestore(lock, flags); \
return val; \
} \
EXPORT_SYMBOL(atomic64_##op##_return);
long long atomic64_add_return(long long a, atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
long long val;
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
ATOMIC64_OP_RETURN(op, c_op)
raw_spin_lock_irqsave(lock, flags);
val = v->counter += a;
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_add_return);
ATOMIC64_OPS(add, +=)
ATOMIC64_OPS(sub, -=)
void atomic64_sub(long long a, atomic64_t *v)
{
unsigned long flags;
raw_spinlock_t *lock = lock_addr(v);
raw_spin_lock_irqsave(lock, flags);
v->counter -= a;
raw_spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_sub);
long long atomic64_sub_return(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 -= a;
raw_spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_sub_return);
#undef ATOMIC64_OPS
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
long long atomic64_dec_if_positive(atomic64_t *v)
{