linux-kernel - Re: [RFC][PATCH 08/42] make sure do_dentry_open() won't return positive as an error

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Date:   Wed, 11 Jul 2018 03:41:35 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: Re: [RFC][PATCH 08/42] make sure do_dentry_open() won't return
 positive as an error

On Tue, Jul 10, 2018 at 07:39:07PM -0700, Linus Torvalds wrote:
> On Tue, Jul 10, 2018 at 7:23 PM Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> >
> >  cleanup_all:
> > +       if (unlikely(error > 0)) {
> > +               WARN_ON(1);
> > +               error = -EINVAL;
> > +       }
> 
> Can we please do this as
> 
>         if (WARN_ON_ONCE(error > 0))
>                 error = -EINVAL;
> 
> 
> instead?
> 
> That already should do the unlikely for you, and *if* somebody can
> trigger this, at least they won't be spamming the logs and making a
> mess. A single warning is fine.

No problem, will do...