linux-kernel - Re: [PATCH] drivers/hwmon: Use pr_fmt and pr

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Date:	Wed, 20 Oct 2010 11:35:44 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Joe Perches <joe@...ches.com>
CC:	Jean Delvare <khali@...ux-fr.org>,
	Hans de Goede <j.w.r.degoede@....nl>,
	Alistair John Strachan <alistair@...zero.co.uk>,
	Henrik Rydberg <rydberg@...omail.se>,
	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	Luca Tettamanti <kronos.it@...il.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Juerg Haefliger <juergh@...il.com>,
	Eric Piel <eric.piel@...mplin-utc.net>,
	Jim Cromie <jim.cromie@...il.com>,
	Roger Lucas <vt8231@...denengine.co.uk>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/hwmon: Use pr_fmt and pr_<level>

On Wed, Oct 20, 2010 at 02:02:42PM -0400, Joe Perches wrote:
> On Wed, 2010-10-20 at 10:48 -0700, Guenter Roeck wrote:
> > The modified define in kernel.org would only apply if pr_fmt isn't already defined,
> > so that argument is not really correct. The real difference would be that you could
> > then remove the individual pr_fmt defines from 211 files, and all users of pr_fmt
> > without module name (ie those hard to read) would be easier to read/identify.
> 
> I think that's not a good idea for now,
> though I agree with the general concept.
> 
> This is in kernel.h now.
> 
> #ifndef pr_fmt
> #define pr_fmt(fmt) fmt
> #endif
> 
> A lot of the pr_<level> calls already include
> some internal prefix.
> 
> Try:
> $ grep -rP --include=*.[ch] -oh "\bpr_\w+\s*\(\s*\"\w+:" * | \
> 	cut -f2- -d"(" | sort | uniq -c | sort -rn
> 
> You're suggesting modifying 100+ files to get the
> same output used now.
> 
Yes, plus another 200+ files to remove the then-unnecessary existing pr_fmt defines.

> I think doing something like this after some more
> generally accepted agreement is reached on how best
> to do it would be better.
> 
Sounds like the ~400 definitions of TRUE and FALSE in the code base I am working with here.

My take is that the time to reach such an agreement is now, to avoid cluttering more code
with pr_fmt defines. The longer we wait, the more difficult it will get to reach an agreement,
since more and more subsystems will be affected.

Personally, I think the pr_fmt cleanup should be more important than replacing printk
with pr_<level>. But I'll defer to Jean's judgement on this one, and follow his lead.

Guenter
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