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>

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--;