linux-kernel - Re: [PATCH 4/7] fs/udf/truncate.c: Use BUG

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Date:	Sun, 17 Feb 2008 20:29:02 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	bfennema@...con.csc.calpoly.edu, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/7] fs/udf/truncate.c: Use BUG_ON

On Sun, Feb 17, 2008 at 06:56:18PM +0100, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> if (...) BUG(); should be replaced with BUG_ON(...) when the test has no
> side-effects to allow a definition of BUG_ON that drops the code completely.

The same change is in my patch which is waiting for inclusion.

http://lkml.org/lkml/2008/1/30/512

> The semantic patch that makes this change is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @ disable unlikely @ expression E,f; @@
> 
> (
>   if (<... f(...) ...>) { BUG(); }
> |
> - if (unlikely(E)) { BUG(); }
> + BUG_ON(E);
> )
> 
> @@ expression E,f; @@
> 
> (
>   if (<... f(...) ...>) { BUG(); }
> |
> - if (E) { BUG(); }
> + BUG_ON(E);
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
> 
> diff -u -p a/fs/udf/truncate.c b/fs/udf/truncate.c
> --- a/fs/udf/truncate.c 2008-02-10 22:34:15.000000000 +0100
> +++ b/fs/udf/truncate.c 2008-02-17 16:41:19.000000000 +0100
> @@ -224,8 +224,7 @@ void udf_truncate_extents(struct inode *
>  				if (indirect_ext_len) {
>  					/* We managed to free all extents in the
>  					 * indirect extent - free it too */
> -					if (!epos.bh)
> -						BUG();
> +					BUG_ON(!epos.bh);
>  					udf_free_blocks(sb, inode, epos.block,
>  							0, indirect_ext_len);
>  				} else {
> @@ -272,8 +271,7 @@ void udf_truncate_extents(struct inode *
>  		}
>  
>  		if (indirect_ext_len) {
> -			if (!epos.bh)
> -				BUG();
> +			BUG_ON(!epos.bh);
>  			udf_free_blocks(sb, inode, epos.block, 0,
>  					indirect_ext_len);
>  		} else {
> -
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