mips: fix bitops

Documentation/atomic_ops.txt defines these primitives must contain a memory
barrier both before and after their memory operation.  This is consistent with
the atomic ops implementation on mips.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/asm-mips/bitops.h b/include/asm-mips/bitops.h
index 0d3373f..5478d94 100644 (file)
--- a/include/asm-mips/bitops.h
+++ b/include/asm-mips/bitops.h
@@ -240,6 +240,8 @@ static inline int test_and_set_bit(unsigned long nr,
        unsigned short bit = nr & SZLONG_MASK;
        unsigned long res;
 
+       smp_llsc_mb();
+
        if (cpu_has_llsc && R10000_LLSC_WAR) {
                unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
                unsigned long temp;
@@ -308,6 +310,8 @@ static inline int test_and_clear_bit(unsigned long nr,
        unsigned short bit = nr & SZLONG_MASK;
        unsigned long res;
 
+       smp_llsc_mb();
+
        if (cpu_has_llsc && R10000_LLSC_WAR) {
                unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
                unsigned long temp;
@@ -396,6 +400,8 @@ static inline int test_and_change_bit(unsigned long nr,
        unsigned short bit = nr & SZLONG_MASK;
        unsigned long res;
 
+       smp_llsc_mb();
+
        if (cpu_has_llsc && R10000_LLSC_WAR) {
                unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
                unsigned long temp;