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| author | Christoph Lameter <clameter@sgi.com> | 2008-02-27 20:07:10 +0100 |
|---|---|---|
| committer | Christoph Lameter <clameter@sgi.com> | 2008-02-27 20:07:10 +0100 |
| commit | 9ef64cb4320df821638b508f79aa8b858cca99f0 (patch) | |
| tree | 4efbf0854234f89c6f4413077ec795fc669b5b0a /Documentation/atomic_ops.txt | |
| parent | Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torval... (diff) | |
| parent | Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6 (diff) | |
| download | linux-9ef64cb4320df821638b508f79aa8b858cca99f0.tar.xz linux-9ef64cb4320df821638b508f79aa8b858cca99f0.zip | |
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 f20c10c2858f..4ef245010457 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) |