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, 4 insertions, 4 deletions

diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.h
index 84a383806b2c..9255cfbee459 100644
--- a/arch/mips/include/asm/bitops.h
+++ b/arch/mips/include/asm/bitops.h
@@ -42,7 +42,7 @@
 /*
  * clear_bit() doesn't provide any barrier for the compiler.
  */
-#define smp_mb__before_clear_bit()      smp_llsc_mb()
+#define smp_mb__before_clear_bit()      smp_mb__before_llsc()
 #define smp_mb__after_clear_bit()       smp_llsc_mb()
 
 /*
@@ -258,7 +258,7 @@ static inline int test_and_set_bit(unsigned long nr,
         unsigned short bit = nr & SZLONG_MASK;
         unsigned long res;
 
-        smp_llsc_mb();
+        smp_mb__before_llsc();
 
         if (kernel_uses_llsc && R10000_LLSC_WAR) {
                 unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
@@ -395,7 +395,7 @@ static inline int test_and_clear_bit(unsigned long nr,
         unsigned short bit = nr & SZLONG_MASK;
         unsigned long res;
 
-        smp_llsc_mb();
+        smp_mb__before_llsc();
 
         if (kernel_uses_llsc && R10000_LLSC_WAR) {
                 unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
@@ -485,7 +485,7 @@ static inline int test_and_change_bit(unsigned long nr,
         unsigned short bit = nr & SZLONG_MASK;
         unsigned long res;
 
-        smp_llsc_mb();
+        smp_mb__before_llsc();
 
         if (kernel_uses_llsc && R10000_LLSC_WAR) {
                 unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);