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authorNick Piggin <nickpiggin@yahoo.com.au>2005-11-14 01:07:24 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-14 03:14:16 +0100
commit4a6dae6d382e9edf3ff440b819e554ed706359bc (patch)
tree2945a5095973e2ecf05b503d6deb859083045b8e /include/asm-s390
parent[PATCH] i386: generic cmpxchg (diff)
downloadlinux-4a6dae6d382e9edf3ff440b819e554ed706359bc.tar.xz
linux-4a6dae6d382e9edf3ff440b819e554ed706359bc.zip
[PATCH] atomic: cmpxchg
Introduce an atomic_cmpxchg operation. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-s390')
-rw-r--r--include/asm-s390/atomic.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h
index 9d86ba6f12d0..631014d5de90 100644
--- a/include/asm-s390/atomic.h
+++ b/include/asm-s390/atomic.h
@@ -198,6 +198,8 @@ atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v)
return retval;
}
+#define atomic_cmpxchg(v, o, n) (atomic_compare_and_swap((o), (n), &((v)->counter)))
+
#define smp_mb__before_atomic_dec() smp_mb()
#define smp_mb__after_atomic_dec() smp_mb()
#define smp_mb__before_atomic_inc() smp_mb()