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Diffstat (limited to 'lib/lockref.c')
-rw-r--r--lib/lockref.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/lockref.c b/lib/lockref.c
index 677d036cf3c7..e294ae445c9a 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -4,6 +4,14 @@
#ifdef CONFIG_CMPXCHG_LOCKREF
/*
+ * Allow weakly-ordered memory architectures to provide barrier-less
+ * cmpxchg semantics for lockref updates.
+ */
+#ifndef cmpxchg64_relaxed
+# define cmpxchg64_relaxed cmpxchg64
+#endif
+
+/*
* Note that the "cmpxchg()" reloads the "old" value for the
* failure case.
*/
@@ -14,8 +22,9 @@
while (likely(arch_spin_value_unlocked(old.lock.rlock.raw_lock))) { \
struct lockref new = old, prev = old; \
CODE \
- old.lock_count = cmpxchg64(&lockref->lock_count, \
- old.lock_count, new.lock_count); \
+ old.lock_count = cmpxchg64_relaxed(&lockref->lock_count, \
+ old.lock_count, \
+ new.lock_count); \
if (likely(old.lock_count == prev.lock_count)) { \
SUCCESS; \
} \