linux-kernel - Re: [PATCH 5/9 V2] idr: covert BUG_ON() to WARN_ON

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Message-ID: <20140419234740.GD3277@htj.dyndns.org>
Date:	Sat, 19 Apr 2014 19:47:40 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Monam Agarwal <monamagarwal123@...il.com>,
	Jeff Layton <jlayton@...hat.com>,
	Andreas Gruenbacher <agruen@...bit.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH 5/9 V2] idr: covert BUG_ON() to WARN_ON_ONCE() if the
 argument is invalid.

Hello,

On Sat, Apr 19, 2014 at 10:04:06PM +0800, Lai Jiangshan wrote:
> On Sat, Apr 19, 2014 at 9:07 PM, Tejun Heo <tj@...nel.org> wrote:
> WARN_ON_ONCE() for invalid id (negative id).
> idr_remove_warning() for unallocated id.

I don't know.  Seem like an unnecessary distinction.

> >> @@ -1030,6 +1030,9 @@ void ida_remove(struct ida *ida, int id)
> >>       int n;
> >>       struct ida_bitmap *bitmap;
> >>
> >> +     if (WARN_ON_ONCE(id < 0))
> >> +             return;
> >
> > Why not jump to err?
> 
> WARN_ON_ONCE() for invalid id (negative id).
> "goto err" for unallocated id.

Ditto.

Thanks.

-- 
tejun
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