Re: [PATCH] [2.6.24-rc3-mm1] loop cleanup in fs/namespace.c - repost

[Dmitri Vorobiev <dmitri.vorobiev@gmail.com>]

Zach Brown пишет:
>>> This doesn't look fine.  Did you test this?
>> Oops, my fault. Of course, I tested the patch, but kernel modules are
>> disabled in my test setup, so I missed the error.
> 
> :)
> 
>> Enclosed to this message is a new patch, which replaces the goto-loop by
>> the while-based one, but leaves the EXPORT_SYMBOL macro intact.
> 
> It certainly looks OK to me now, for whatever that's worth. 

Zach, thank you for the code review and suggestions.

> 
> You probably want to wait 'till the next merge window to get it in,
> though.  It's just a cleanup and so shouldn't go in this late in the -rc
> line.
> 
> Maybe Andrew will be willing to queue it until that time in -mm.

I am enclosing the patch against current -mm tree and adding Andrew to the Cc: list.

Thanks,

Dmitri

> 
> - z
> 

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>
---
diff --git a/fs/namespace.c b/fs/namespace.c
index 79883fe..b098b63 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -606,19 +606,17 @@ static inline void __mntput(struct vfsmo
 
 void mntput_no_expire(struct vfsmount *mnt)
 {
-repeat:
-	if (atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock)) {
+	while (atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock)) {
 		if (likely(!mnt->mnt_pinned)) {
 			spin_unlock(&vfsmount_lock);
 			__mntput(mnt);
-			return;
+			break;
 		}
 		atomic_add(mnt->mnt_pinned + 1, &mnt->mnt_count);
 		mnt->mnt_pinned = 0;
 		spin_unlock(&vfsmount_lock);
 		acct_auto_close_mnt(mnt);
 		security_sb_umount_close(mnt);
-		goto repeat;
 	}
 }