linux-kernel - Re: [PATCH] drivers/misc/kgdbts.c: remove eprintk

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Date:	Sun, 4 Nov 2012 20:51:58 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	walter harms <wharms@....de>, kernel-janitors@...r.kernel.org,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/misc/kgdbts.c: remove eprintk

On Sunday 04 November 2012, Julia Lawall wrote:

> > Hmm, I did not think that WARN() took a KERN_ERR argument, which should
> > really be implied here. Looking at the code, it really seems to be required
> > at the moment, but only 5 out of 117 callers use it this way.
> >
> > Any idea what is going on here?
> 
> I'm not sure to understand the 5 and 117.  Using grep, I get 30 with 
> KERN_ERR, 61 with some KERN thing, and 1207 without KERN. 

Right, I was using 'grep -w', which misses a lot of the instances, although
I see still much fewer in the last category.

> If things are 
> set up such that warn_slowpath_fmt is called, then that function adds
> KERN_WARNING.  There is an alternate definition of __WARN_printf that just 
> does a printk.

I don't see yet where that KERN_WARNING gets added. Looking at
warn_slowpath_common, there are two or three lines that get printed at 
KERN_WARNING level, followed by the format that got passed into WARN(),
which may or may not include a printk level, but I don't see one getting
added.


	Arnd
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