linux-kernel - Re: [PATCH] Staging: rtl8188eu: Remove zero testing pointer typed value

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Date:	Fri, 03 Apr 2015 10:01:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Amitoj Kaur Chawla <amitoj1606@...il.com>,
	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: rtl8188eu: Remove zero testing pointer typed
 value

On Fri, 2015-04-03 at 19:51 +0300, Dan Carpenter wrote:
> On Fri, Apr 03, 2015 at 10:12:11PM +0530, Amitoj Kaur Chawla wrote:
> > Removes variable comparison with 0 by using !. 
> 
> Sometimes testing for zero makes sense.
> When you write code, you are
> telling a story.  If you are talking about zero as a number then it
> can make sense.  If it's zero as a boolean then it doesn't make sense.

Very true.

> Also strcmp() and similar should always be done as == 0, < 0 or != 0
> because that is the idiom:

Less true.

When testing for equality, !strcmp is very common.

There are ~2500 uses of !strcmp in the kernel tree vs
~1500 uses of strcmp() == or !=


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