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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

8
arch/mips/include/asm/bitops.h
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@@ -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);