MIPS: New macro smp_mb__before_llsc.

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index 21ef9efbde43..5f16696eaa00 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -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__(