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Diffstat (limited to 'Documentation/atomic_ops.txt')
| -rw-r--r-- | Documentation/atomic_ops.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index dab6da338..b19fc34ef 100644 --- a/Documentation/atomic_ops.txt +++ b/Documentation/atomic_ops.txt @@ -266,7 +266,9 @@ with the given old and new values. Like all atomic_xxx operations, atomic_cmpxchg will only satisfy its atomicity semantics as long as all other accesses of *v are performed through atomic_xxx operations. -atomic_cmpxchg must provide explicit memory barriers around the operation. +atomic_cmpxchg must provide explicit memory barriers around the operation, +although if the comparison fails then no memory ordering guarantees are +required. The semantics for atomic_cmpxchg are the same as those defined for 'cas' below. |