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alpha: 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 alpha.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Nick Piggin 2007-10-18 03:06:50 -07:00 committed by Linus Torvalds
parent 26333576fd
commit 7c29ca5b8d
1 changed files with 9 additions and 0 deletions
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9
include/asm-alpha/bitops.h
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@ -117,6 +117,9 @@ test_and_set_bit(unsigned long nr, volatile void *addr)
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, volatile void * addr)
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, volatile void * addr)
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"