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| author | David Woodhouse <dwmw2@infradead.org> | 2008-04-22 12:34:25 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2008-04-22 12:34:25 +0100 |
| commit | f838bad1b3be8ca0c785ee0e0c570dfda74cf377 (patch) | |
| tree | 5a842a8056a708cfad55a20fa8ab733dd94b0903 /Documentation/atomic_ops.txt | |
| parent | dd919660aacdf4adfcd279556aa03e595f7f0fc2 (diff) | |
| parent | 807501475fce0ebe68baedf87f202c3e4ee0d12c (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'Documentation/atomic_ops.txt')
| -rw-r--r-- | Documentation/atomic_ops.txt | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index f20c10c2858..4ef24501045 100644 --- a/Documentation/atomic_ops.txt +++ b/Documentation/atomic_ops.txt @@ -186,7 +186,8 @@ If the atomic value v is not equal to u, this function adds a to v, and returns non zero. If v is equal to u then it returns zero. This is done as an atomic operation. -atomic_add_unless requires explicit memory barriers around the operation. +atomic_add_unless requires explicit memory barriers around the operation +unless it fails (returns 0). atomic_inc_not_zero, equivalent to atomic_add_unless(v, 1, 0) |