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 alpha.
Signed-off-by: Nick Piggin <[EMAIL PROTECTED]>
---
include/asm-alpha/bitops.h | 9 +++++++++
1 file changed, 9 insertions(+)
Index: linux-2.6/include/asm-alpha/bitops.h
===================================================================
--- linux-2.6.orig/include/asm-alpha/bitops.h
+++ linux-2.6/include/asm-alpha/bitops.h
@@ -117,6 +117,9 @@ test_and_set_bit(unsigned long nr, volat
int *m = ((int *) addr) + (nr >> 5);
__asm__ __volatile__(
+#ifdef CONFIG_SMP
+ " mb\n"
+#endif
"1: ldl_l %0,%4\n"
" and %0,%3,%2\n"
" bne %2,2f\n"
@@ -158,6 +161,9 @@ test_and_clear_bit(unsigned long nr, vol
int *m = ((int *) addr) + (nr >> 5);
__asm__ __volatile__(
+#ifdef CONFIG_SMP
+ " mb\n"
+#endif
"1: ldl_l %0,%4\n"
" and %0,%3,%2\n"
" beq %2,2f\n"
@@ -199,6 +205,9 @@ test_and_change_bit(unsigned long nr, vo
int *m = ((int *) addr) + (nr >> 5);
__asm__ __volatile__(
+#ifdef CONFIG_SMP
+ " mb\n"
+#endif
"1: ldl_l %0,%4\n"
" and %0,%3,%2\n"
" xor %0,%3,%0\n"
-
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