linux-kernel - Re: [patch 2/3] Add flags parameter to reserve_bootmem

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Date:	Mon, 9 Jun 2008 16:54:29 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Bernhard Walle <bwalle@...e.de>
Cc:	Amul Shah <amul.shah@...sys.com>, Andi Kleen <andi@...stfloor.org>,
	Johannes Weiner <hannes@...urebad.de>,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, anderson@...hat.com,
	"Romer, Benjamin M" <Benjamin.Romer@...sys.com>
Subject: Re: [patch 2/3] Add flags parameter to reserve_bootmem_generic()

On Mon, Jun 09, 2008 at 10:42:11PM +0200, Bernhard Walle wrote:
> Hi Vivek,
> 
> * Vivek Goyal <vgoyal@...hat.com> [2008-06-09 16:29]:
> >
> > Can you please put some more explanation comment here to explain that
> > why it is ok to return with success, despite the fact that we never
> > reserved any memory.
> 
> Do you think that's ok?
> 
>     When booting the kdump kernel, the MP tables (for example,
>     or other firmware-reserved memory) of the BIOS are beyond
>     end_pfn. (kexec-tools adds exactmap parameters to the kernel
>     so that the E820 map is no longer used.) Therefore, it's ok
>     to return "success" here. For normal boot, the MP tables
>     must be reserved normally.
> 

Looks good. Thanks

Vivek
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