diff options
| author | Richard Kennedy <richard@rsk.demon.co.uk> | 2010-05-14 10:49:22 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-05-21 18:31:21 -0400 |
| commit | 2e147f1ef7d593b36c0e27a393b7d7ec0765f54b (patch) | |
| tree | cc7746744467dfcedd8e5068eac982fc9c308515 /fs | |
| parent | a7cf4145bb86aaf85d4d4d29a69b50b688e2e49d (diff) | |
| download | lwn-2e147f1ef7d593b36c0e27a393b7d7ec0765f54b.tar.gz lwn-2e147f1ef7d593b36c0e27a393b7d7ec0765f54b.zip | |
fs: inode.c use atomic_inc_return in __iget
Using atomic_inc_return in __iget(struct inode *inode) makes the intent
of this code clearer and generates less code on processors that have
this operation.
On x86_64 this patch reduces the text size of inode.o by 12 bytes.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
----
patch against 2.6.34-rc7
compiled & tested on x86_64 AMD X2
I've been running with this patch applied for several weeks with no
obvious problems.
regards
Richard
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/inode.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/inode.c b/fs/inode.c index 258ec22bb298..498b10f04c3c 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -286,11 +286,9 @@ static void init_once(void *foo) */ void __iget(struct inode *inode) { - if (atomic_read(&inode->i_count)) { - atomic_inc(&inode->i_count); + if (atomic_inc_return(&inode->i_count) != 1) return; - } - atomic_inc(&inode->i_count); + if (!(inode->i_state & (I_DIRTY|I_SYNC))) list_move(&inode->i_list, &inode_in_use); inodes_stat.nr_unused--; |