linux-ext4 - Re: [PATCH 2/9] ext4: Use pr_fmt and pr

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Date:	Tue, 20 Mar 2012 09:47:03 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	David Miller <davem@...emloft.net>
CC:	Valdis.Kletnieks@...edu, joe@...ches.com, tytso@....edu,
	anca.emanuel@...il.com, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] ext4: Use pr_fmt and pr_<level>

On 03/20/2012 08:10 AM, David Miller wrote:
> From: Valdis.Kletnieks@...edu
> Date: Tue, 20 Mar 2012 01:46:06 -0400
> 
>> OK. Say I'm a scraper.  How do I distinguish between:
>>
>> pr_info("foo");
>> printk(KERN_INFO "foo");
>>
>> Oh my. seems that both result in exactly the same thing ending up in the
>> dmesg buffer
> 
> No it doesn't result in the same output, read the definitions again.
> 
> pr_info can be influenced by pr_fmt, plain printk cannot

Ok, but how exactly does one select per-subsystem messages relying only
on pr_fmt?

Joe writes: "notify a particular set of per subsystem messages that
pr_<level> could easily provide"

Maybe the concept is not explained well enough that we do not follow?

thanks,
-- 
js
suse labs
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