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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
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/mips/include/asm/atomic.h
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@@ -137,7 +137,7 @@ static __inline__ int atomic_add_return(int i, atomic_t * v)
{
int result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
@@ -189,7 +189,7 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v)
{
int result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
@@ -249,7 +249,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
{
int result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
int temp;
@@ -516,7 +516,7 @@ static __inline__ long atomic64_add_return(long i, atomic64_t * v)
{
long result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
@@ -568,7 +568,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
{
long result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
@@ -628,7 +628,7 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
{
long result;
smp_llsc_mb();
smp_mb__before_llsc();
if (kernel_uses_llsc && R10000_LLSC_WAR) {
long temp;
@@ -788,9 +788,9 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
* atomic*_return operations are serializing but not the non-*_return
* versions.
*/
#define smp_mb__before_atomic_dec() smp_llsc_mb()
#define smp_mb__before_atomic_dec() smp_mb__before_llsc()
#define smp_mb__after_atomic_dec() smp_llsc_mb()
#define smp_mb__before_atomic_inc() smp_llsc_mb()
#define smp_mb__before_atomic_inc() smp_mb__before_llsc()
#define smp_mb__after_atomic_inc() smp_llsc_mb()
#include <asm-generic/atomic-long.h>