linux-kernel - Re: [3.9-rc1 x86] Bug in ioremap code?

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Date:	Wed, 06 Mar 2013 03:16:56 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
CC:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: [3.9-rc1 x86] Bug in ioremap code?

On 03/06/2013 02:16 AM, Tetsuo Handa wrote:
> 
> But I found that this bug occurs only when the system has little RAM.
> 
> With 892MB RAM where /proc/meminfo would show HighTotal > 0,
> this bug does not occur.
> 
>     HighTotal:          4040 kB
>     LowTotal:         873960 kB
> 
> With 888MB RAM where /proc/meminfo would show HighTotal == 0,
> this bug occurs.
> 

OK, this makes sense.  I guess we have a bug in the case where we do not
exhaust lowmem.

	-hpa


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