Re: [PATCH] mm: pgtable: Unlock pml without branches when !start_pte

[Andrew Morton]

On Tue, 11 Feb 2025 14:49:47 +0800 I Hsin Cheng <richard120310@xxxxxxxxx> wrote:

> >       if (ptl != pml)
> > +out_unlock:
> >               spin_unlock(pml);
> >  }
> > _
> >
> > but that's really ugly.
> 
> I agree. Would you be so nice to suggest some test method for me so I
> can try to test how much benefit we can get from this?
> 
> If the case happens frequently enough I think it might be worth it?

I expect this error patch is basically never taken - put a printk in
there and run some tests?