linux-kernel - Re: [PATCH 6 of 7] x86: use early_ioremap in __acpi_map

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Date:	Thu, 11 Sep 2008 11:36:47 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 6 of 7] x86: use early_ioremap in __acpi_map_table

Ingo Molnar wrote:
> the false positive should be avoided, for example by unmapping the 
> 'prev' mapping shortly before the leak check.
>   

Yep.  I'll make it unmap just before setting acpi_gbl_permanent_mmap,
which is when it switches to using plain old ioremap.

>> (All those other backtraces are just informational, right?)
>>     
>
> no, they cause hard failures in my test setup. Nor do we want to litter 
> the bootup log with messages that are not correct.
>   

No, I mean that early_ioremap_debug causes all early_ioremap()s to dump
a stack trace, so most of the stack dumps in the boot log are
diagnostic/informational rather than indications of lots of problems.

    J
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