linux-kernel - Re: [PATCH 01/12] staging: lustre: fid: Use !x to check for kzalloc failure

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Message-ID: <20150623095704.GO28762@mwanda>
Date:	Tue, 23 Jun 2015 12:57:04 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"Dilger, Andreas" <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Drokin, Oleg" <oleg.drokin@...el.com>,
	"lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 01/12] staging: lustre: fid: Use !x to check for kzalloc
 failure

Yes.  I know Al's thoughts and kernel style.

But Alan Cox and Andreas have both said they think (x == NULL) can help
you avoid some kind of boolean vs pointer bugs.  I've had co-workers who
did massive seds changing !foo to foo == NULL on our code base.  But
I've never seen a real life example of a bug this fixes.

To be honest, I've never seen a real life proof that (!foo) code is less
buggy.  I should look through the kbuild mailbox...  Hm...  But my other
idea of setting up code style readability testing website is also a good
one.

Linux kernel style is based on Joe Perches finding that 80% of the code
prefers one way or the other.  That's a valid method for determining
code style.  I bet it normally picks the more readable style but it
would be interesting to measure it more formally.

regards,
dan carpenter

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