linux-kernel - Re: [PATCH 12/19] staging: lustre: libcfs: remove == 0 testing

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Message-ID: <alpine.LFD.2.20.1611181642470.3854@casper.infradead.org>
Date:   Fri, 18 Nov 2016 16:46:40 +0000 (GMT)
From:   James Simmons <jsimmons@...radead.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 12/19] staging: lustre: libcfs: remove == 0 testing


> On Thu, Nov 17, 2016 at 02:35:50PM -0500, James Simmons wrote:
> > Testing == 0 is not kernel style so remove this
> > type of testing from libcfs.
> > 
> 
> That's not true.  Checkpatch.pl won't complain.
>

It got lumped in with the checkpatch fixes. Also the __uXX problem is not 
reported by checkpatch so this patch series covers checkpatch + style 
issues. 

> Not everyone has thought about it or agrees with me but there are time
> when == 0 is idiomatic.  For example, if you are talking about the
> *number* zero then it should probably be == 0.  If it's like "rc == 0"
> then "rc" doesn't mean the number it means success/fail so it should be
> "if (!rc) ".  But it's intuitive to say "if (len == 0) ".
> 
> The other place is strcmp() and friends where it's much more intuitive:
> 
> 	strcmp(a, b) == 0 means a == b
> 	strcmp(a, b) < 0 means a < b
> 	strcmp(a, b) != 0 means a != b

Oh this I didn't know. I will keep this in mind for the future.