linux-ext4 - Re: [PATCH 1/4] ext4: fold two if statements into one

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Message-ID: <20111029131445.GE19536@thunk.org>
Date:	Sat, 29 Oct 2011 09:14:45 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/4] ext4: fold two if statements into one

On Wed, Oct 26, 2011 at 03:11:49PM +0800, Yongqiang Yang wrote:
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
> ---
>  fs/ext4/extents.c |   23 +++++++++++------------
>  1 files changed, 11 insertions(+), 12 deletions(-)

Unfortunately this patch is incorrect since it changes when the else
clause would get executed:

       if (a) {
       	   if (b) {
	       ...
	   }
       } else {
           ...
       }

is not the same as:

       if (a && b) {
	   ...
       } else {
           ...
       }

Regards,

					- Ted
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