MIPS: atomic: Use _atomic barriers in atomic_sub_if_positive()

Use smp_mb__before_atomic() & smp_mb__after_atomic() in
atomic_sub_if_positive() rather than the equivalent
smp_mb__before_llsc() & smp_llsc_mb(). The former are more standard &
this preps us for avoiding redundant duplicate barriers on Loongson3 in
a later patch.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Paul Burton 2019-10-01 21:53:21 +00:00
parent 4d1dbfe6cb
commit 77d281b796
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@ -196,7 +196,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
{
int result;
smp_mb__before_llsc();
smp_mb__before_atomic();
if (kernel_uses_llsc) {
int temp;
@ -237,7 +237,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
* another barrier here.
*/
if (!__SYNC_loongson3_war)
smp_llsc_mb();
smp_mb__after_atomic();
return result;
}