]> pilppa.com Git - linux-2.6-omap-h63xx.git/commitdiff
proc: less LOCK operations during lookup
authorAlexey Dobriyan <adobriyan@sw.ru>
Fri, 8 Feb 2008 12:18:27 +0000 (04:18 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 8 Feb 2008 17:22:23 +0000 (09:22 -0800)
Pseudo-code for lookup effectively is:

LOCK kernel
LOCK proc_subdir_lock
find PDE
UNLOCK proc_subdir_lock

get inode

LOCK proc_subdir_lock
goto unlock
UNLOCK proc_subdir_lock
UNLOCK kernel

We can get rid of LOCK/UNLOCK pair after getting inode simply by jumping
to unlock_kernel() directly.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/generic.c

index 6a2fe5187b6265db0c896aa9e68ec6fb7507a3a4..75cd8d709f7f791e05b31b9a42491da7e918acbc 100644 (file)
@@ -406,12 +406,12 @@ struct dentry *proc_lookup(struct inode * dir, struct dentry *dentry, struct nam
                                spin_unlock(&proc_subdir_lock);
                                error = -EINVAL;
                                inode = proc_get_inode(dir->i_sb, ino, de);
-                               spin_lock(&proc_subdir_lock);
-                               break;
+                               goto out_unlock;
                        }
                }
        }
        spin_unlock(&proc_subdir_lock);
+out_unlock:
        unlock_kernel();
 
        if (inode) {