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Commit 6e490b01 authored by Will Deacon's avatar Will Deacon Committed by Ingo Molnar
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ARM, locking/atomics: Implement _relaxed variants of atomic[64]_{inc,dec} 



Now that the core code supports acquire/release/relaxed versions of
the atomic_inc family, implement only the _relaxed flavours in the ARM
backend so that we get all of the others for free.

Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
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>
Link: http://lkml.kernel.org/r/1444227038-12533-1-git-send-email-will.deacon@arm.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent a1a2ab2f

arch/arm/include/asm/atomic.h

+4 −4
Original line number Diff line number Diff line
@@ -210,8 +210,8 @@ ATOMIC_OP(xor, ^=, eor) 


#define atomic_inc_and_test(v)	(atomic_add_return(1, v) == 0)

#define atomic_dec_and_test(v)	(atomic_sub_return(1, v) == 0)

#define atomic_inc_return(v)    (atomic_add_return(1, v))

#define atomic_dec_return(v)    (atomic_sub_return(1, v))

#define atomic_inc_return_relaxed(v)    (atomic_add_return_relaxed(1, v))

#define atomic_dec_return_relaxed(v)    (atomic_sub_return_relaxed(1, v))

#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)



#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
@@ -442,11 +442,11 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u) 


#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)

#define atomic64_inc(v)			atomic64_add(1LL, (v))

#define atomic64_inc_return(v)		atomic64_add_return(1LL, (v))

#define atomic64_inc_return_relaxed(v)	atomic64_add_return_relaxed(1LL, (v))

#define atomic64_inc_and_test(v)	(atomic64_inc_return(v) == 0)

#define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)

#define atomic64_dec(v)			atomic64_sub(1LL, (v))

#define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))

#define atomic64_dec_return_relaxed(v)	atomic64_sub_return_relaxed(1LL, (v))

#define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)

#define atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1LL, 0LL)