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MIPS: New macro smp_mb__before_llsc.

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Replace some instances of smp_llsc_mb() with a new macro
smp_mb__before_llsc().  It is used before ll/sc sequences that are
documented as needing write barrier semantics.

The default implementation of smp_mb__before_llsc() is just smp_llsc_mb(),
so there are no changes in semantics.

Also simplify definition of smp_mb(), smp_rmb(), and smp_wmb() to be just
barrier() in the non-SMP case.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/851/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
2010-01-08 17:17:43 -08:00
committed by Ralf Baechle
parent ec5380c768
commit f252ffd50c
6 changed files with 32 additions and 25 deletions
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4
arch/mips/include/asm/spinlock.h
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@@ -138,7 +138,7 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
int tmp;
smp_llsc_mb();
smp_mb__before_llsc();
if (R10000_LLSC_WAR) {
__asm__ __volatile__ (
@@ -305,7 +305,7 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
{
unsigned int tmp;
smp_llsc_mb();
smp_mb__before_llsc();
if (R10000_LLSC_WAR) {
__asm__ __volatile__(