linux-kernel - Re: [PATCH] kernel/range.c: subtract_range: fix the broken phrase issued by printk

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Message-ID: <5153A1C7.6030409@cn.fujitsu.com>
Date:	Thu, 28 Mar 2013 09:49:59 +0800
From:	Lin Feng <linfeng@...fujitsu.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH] kernel/range.c: subtract_range: fix the broken phrase
 issued by printk

Hi Bjorn and others,

On 03/28/2013 01:27 AM, Bjorn Helgaas wrote:
>> -                               printk(KERN_ERR "run of slot in ranges\n");
>> > +                               pr_err("%s: run out of slot in ranges\n",
>> > +                                       __func__);
>> >                         }
>> >                         range[j].end = start;
>> >                         continue;
> So now the user might see:
> 
>     subtract_range: run out of slot in ranges
> 
> What is the user supposed to do when he sees that?  If he happens to
> mention it on LKML, what are we going to do about it?  If he attaches
> the complete dmesg log, is there enough information to do something?
> 
> IMHO, that message is still totally useless.
> 

Yes, we need to issue some useful message. 
How about dump_stack() there so that we can find some clues more since
subtract_range() is called mtrr_bp_init path and pci relative path, then
it may help to instruct us to do something ;-) ?

thanks,
linfeng
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