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fs: inode.c use atomic_inc_return in __iget

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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>
This commit is contained in:
Richard Kennedy 2010-05-14 10:49:22 +01:00 committed by Al Viro
parent a7cf4145bb
commit 2e147f1ef7
1 changed files with 2 additions and 4 deletions
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6
fs/inode.c
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@ -286,11 +286,9 @@ static void init_once(void *foo)
*/ */
void __iget(struct inode *inode) void __iget(struct inode *inode)
{ {
if (atomic_read(&inode->i_count)) { if (atomic_inc_return(&inode->i_count) != 1)
atomic_inc(&inode->i_count);
return; return;
}
atomic_inc(&inode->i_count);
if (!(inode->i_state & (I_DIRTY|I_SYNC))) if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_in_use); list_move(&inode->i_list, &inode_in_use);
inodes_stat.nr_unused--; inodes_stat.nr_unused--;