linux-kernel - Re: [PATCH 20/31] lmb: Add __NOT_KEEP

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Message-ID: <1269899097.7101.29.camel@pasglop>
Date:	Tue, 30 Mar 2010 08:44:57 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	yinghai@...nel.org, michael@...erman.id.au, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 20/31] lmb: Add __NOT_KEEP_LMB to put lmb code to .init

On Mon, 2010-03-29 at 12:11 -0700, David Miller wrote:
> From: Yinghai Lu <yinghai@...nel.org>
> Date: Mon, 29 Mar 2010 11:39:52 -0700
> 
> > On 03/29/2010 11:34 AM, David Miller wrote:
> >> From: Yinghai Lu <yinghai@...nel.org>
> >> Date: Mon, 29 Mar 2010 09:20:28 -0700
> >> 
> >>> BTW, it seems only PowerPC need to keep lmb after init stage, right ?
> >> 
> >> For now.  Sparc64 will need it at some point in the future.
> > 
> > for memory hotplug support?
> 
> Yes.

We also can use it to implement page_is_ram() which might help
get /dev/mem cachability setting right by default one day :-)

However, we only need to keep the memory list, not the reserve list.

Cheers,
Ben.


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