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

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Date:	Sat, 19 Apr 2014 09:07:26 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	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.

On Sat, Apr 19, 2014 at 07:38:12PM +0800, Lai Jiangshan wrote:
> @@ -559,7 +559,7 @@ void idr_remove(struct idr *idp, int id)
>  	struct idr_layer *p;
>  	struct idr_layer *to_free;
>  
> -	if (id < 0)
> +	if (WARN_ON_ONCE(id < 0))
>  		return;

ISTR callers which call in with error value, but yeah weeding them out
could be a good idea.  Shouldn't it be idr_remove_warning() though?

> @@ -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?

> +
>  	if (idr_id > idr_max(ida->idr.layers))
>  		goto err;
>  
> @@ -1096,13 +1099,14 @@ int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
>  	unsigned int max;
>  	unsigned long flags;
>  
> -	BUG_ON((int)start < 0);
> -	BUG_ON((int)end < 0);
> +	if (WARN_ON_ONCE(((int)start < 0) || ((int)end < 0)))
> +		return -EINVAL;
>  
>  	if (end == 0)
>  		max = 0x80000000;
>  	else {
> -		BUG_ON(end < start);
> +		if (WARN_ON_ONCE(end < start))
> +			return -ENOSPC;

-EINVAL

Thanks.

-- 
tejun
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