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

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Date:	Wed, 20 Oct 2010 10:28:20 -0700
From:	Joe Perches <joe@...ches.com>
To:	Guenter Roeck <guenter.roeck@...csson.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, 2010-10-20 at 10:18 -0700, Guenter Roeck wrote:
> On Wed, Oct 20, 2010 at 12:54:20PM -0400, Joe Perches wrote:
> > On Wed, 2010-10-20 at 09:49 -0700, Guenter Roeck wrote:
> > > On Wed, Oct 20, 2010 at 11:59:23AM -0400,
> > >  Joe Perches wrote:
> > > [ ... ]
> > > > Anyway, I'd like to sort it out eventually.
> > > > For now, I just add the #define pr_fmt, with
> > > > a long term goal of removing them all and using
> > > > a different mechanism to remove the duplicated
> > > > prefix string altogether from the formats and
> > > > save some text.
> > > I don't mind individual pr_fmt defines as long as they are used.
> > > However, that is not the case in many of the patches.
> > > Just adding a pr_fmt define to a file without using it doesn't make sense to me.
> > kernel.h has the equivalent of:
> > #define pr_<level>(fmt, arg...) printk(KERN_<level> pr_fmt(fmt), ##arg)
> > 
> And no one minds that there are literally hundreds of equivalent defines
> for pr_fmt in the code, and even more conflicting ones ? Odd.
> 
> Maybe the following in kernel.h would make more sense.
> 
> #ifndef pr_fmt
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> #endif
> 
> At least it would make more sense than littering source files with pr_fmt definitions.
> If that doesn't fly, I would prefer to stick with the existing default definition in kernel.h.

That would give you no prefix at all and make the
logging messages harder to distinguish.

> At least that would give people an incentive to fix the problem in kernel.h (or in some other
> central location) if they dislike the resulting missing module names.

I don't think it flies for another year or two.

$ grep -Prh --include=*.[ch] "define\s*pr_fmt" * | \
	perl -p -e 's/[ \t]+/ /g' | \
	sort | uniq -c | sort -rn
    211 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     93 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
     16 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
     16 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
      4 #define pr_fmt(fmt) "intc: " fmt
      4 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
      3 #define pr_fmt(fmt) "%s: " fmt, __func__
      3 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
      2 #define pr_fmt(fmt) "gcov: " fmt
      2 #define pr_fmt(fmt) fmt
      2 #define pr_fmt(fmt) DRV_NAME ": " fmt
      1 #define pr_fmt(fmt) "viod: " fmt
      1 #define pr_fmt(fmt) "tboot: " fmt
      1 #define pr_fmt(fmt) "(stll) :" fmt
      1 #define pr_fmt(fmt) "(stk) :" fmt
      1 #define pr_fmt(fmt) "(stc): " fmt
      1 #define pr_fmt(fmt) "PMU: " fmt
      1 #define pr_fmt(fmt) "pit: " fmt
      1 #define pr_fmt(fmt) "phram: " fmt
      1 #define pr_fmt(fmt) "PCI: " fmt
      1 #define pr_fmt(fmt) "module %s: " fmt
      1 #define pr_fmt(fmt) "mmiotrace: " fmt
      1 #define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt
      1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Append 'batman-adv: ' before
      1 #define pr_fmt(fmt) KBUILD_MODNAME " " fmt
      1 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
      1 #define pr_fmt(fmt) "isram: " fmt
      1 #define pr_fmt(fmt) "hw perfevents: " fmt
      1 #define pr_fmt(fmt) "hw-breakpoint: " fmt
      1 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
      1 #define pr_fmt(fmt) "cxgb: " fmt
      1 #define pr_fmt(fmt) "cn_test: " fmt
      1 #define pr_fmt(fmt) "clock: " fmt
      1 #define pr_fmt(fmt) "acerhdf: " fmt


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