linux-kernel - Re: [PATCH] checkpatch: Suggest pr_<level> over printk(KERN

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Date:	Tue, 13 Mar 2012 19:31:51 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ted Ts'o <tytso@....edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] checkpatch: Suggest pr_<level> over printk(KERN_<LEVEL>

On Tue, 2012-03-13 at 22:19 -0400, Ted Ts'o wrote:
> On Tue, Mar 13, 2012 at 06:17:11PM -0700, Joe Perches wrote:
> > The patch was all apiece, every bit associated to logging output.
> > It was bundled to make it easier to apply.
> > 
> > You call it junk, I call it cleanups.
> 
> Changing stuff to pr_foo is ***NOISE***.  It adds no value, and it
> makes it my life much, MUCH harder.

I dispute that it add no value.

pr_<foo> adds value to the dmesg output because
it can be consistently prefixed via pr_fmt.

Right now many fs ext4 messages are somewhat opaque
without any reference to what kernel subsystem produced
the message.

For instance:

fs/ext4/ialloc.c:		printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",

This is a somewhat senseless output in dmesg without
any linkage to ext4.

Using pr_fmt and pr_debug as I sent a patch to do
instead emits in dmesg:

EXT4-fs: group: etc...

Using subsystem prefixes makes it easy and consistent to
grep dmesg.

cheers, Joe

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