On Wed, Nov 21, 2007 at 03:24:33PM -0800, Andrew Morton wrote:
> -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;
> }
> }
>
> This patch has no changelog which I can use.
BTW, I have a problem with that one. The change is misleading; FWIW,
I'm very tempted to turn that into tail recursion, with
if (!atomic_dec_and_lock(&mnt->mnt_count, &vfsmount_lock))
return;
in the very beginning (i.e. invert the test and pull the body to top level).
-
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