linux-kernel - Re: [PATCH] Fix generic WARN

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Message-Id: <1161809722.3207.3.camel@localhost.localdomain>
Date:	Wed, 25 Oct 2006 16:55:22 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Ingo Molnar <mingo@...e.hu>, Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix generic WARN_ON message

On Wed, 2006-10-25 at 12:04 +0200, Pavel Machek wrote:
> Hi!
> 
> > * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > 
> > > A warning is a warning, not a BUG.
> > 
> > > -		printk("BUG: warning at %s:%d/%s()\n", __FILE__,	\
> > > +		printk("WARNING at %s:%d %s()\n", __FILE__,	\
> > 
> > i'm not really happy about this change.
> > 
> > Firstly, most WARN_ON()s are /bugs/, not warnings ... If it's a real 
> > warning, a KERN_INFO printk should be done.
> > 
> > Secondly, the reason i changed it to the 'BUG: ...' format is that i 
> > tried to make it easier for automated tools (and for users) to figure 
> > out that a kernel bug happened.
> 
> Well... but the message is really bad. It leads to users telling us "I
> hit BUG in kernel"...

But they *did* hit a BUG. It just so happens that the BUG was fixable.
We want this reported because a WARN_ON should *never* be hit unless
there's a bug.  If people start getting "WARNING" messages, they will
more likely not be reporting them.

As Ingo already said, if it is just a "warning" then a normal printk
should be used.

-- Steve


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