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atomics/treewide: Make unconditional inc/dec ops optional

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Many of the inc/dec ops are mandatory, but for most architectures inc/dec are
simply trivial wrappers around their corresponding add/sub ops.

Let's make all the inc/dec ops optional, so that we can get rid of these
boilerplate wrappers.

The instrumented atomics are updated accordingly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/lkml/20180621121321.4761-17-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mark Rutland
2018-06-21 13:13:19 +01:00
committed by Ingo Molnar
parent 18cc1814d4
commit 9837559d8e
24 changed files with 86 additions and 296 deletions
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5
arch/x86/include/asm/atomic.h
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@ -92,6 +92,7 @@ static __always_inline bool arch_atomic_sub_and_test(int i, atomic_t *v)
*
* Atomically increments @v by 1.
*/
#define arch_atomic_inc arch_atomic_inc
static __always_inline void arch_atomic_inc(atomic_t *v)
{
asm volatile(LOCK_PREFIX "incl %0"
@ -104,6 +105,7 @@ static __always_inline void arch_atomic_inc(atomic_t *v)
*
* Atomically decrements @v by 1.
*/
#define arch_atomic_dec arch_atomic_dec
static __always_inline void arch_atomic_dec(atomic_t *v)
{
asm volatile(LOCK_PREFIX "decl %0"
@ -177,9 +179,6 @@ static __always_inline int arch_atomic_sub_return(int i, atomic_t *v)
return arch_atomic_add_return(-i, v);
}
#define arch_atomic_inc_return(v) (arch_atomic_add_return(1, v))
#define arch_atomic_dec_return(v) (arch_atomic_sub_return(1, v))
static __always_inline int arch_atomic_fetch_add(int i, atomic_t *v)
{
return xadd(&v->counter, i);