linux-kernel - Re: [linux-pm] [PATCH] hibernation should work ok with memory hotplug

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Message-Id: <1225902223.12673.616.camel@nimitz>
Date:	Wed, 05 Nov 2008 08:23:43 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	Matt Tolentino <matthew.e.tolentino@...el.com>,
	linux-pm@...ts.osdl.org, Dave Hansen <haveblue@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, pavel@...e.cz,
	Mel Gorman <mel@...net.ie>, Andy Whitcroft <apw@...dowen.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH] hibernation should work ok with memory
	hotplug

On Wed, 2008-11-05 at 20:10 +1100, Nigel Cunningham wrote:
> In your example above, zone_start_pfn will be 1, won't it? If that's the
> case, I shouldn't need to subtract ARCH_PFN_OFFSET to get the right
> index within the zone and avoid the same wastage that ARCH_PFN_OFFSET
> avoids with mem_map.

Yeah, I don't think the first zone will ever start before
ARCH_PFN_OFFSET.

If the code just deals with starting at any random zone_start_pfn and
going to any other random zone_end_pfn without any waste, then it should
be fine in the presence of ARCH_PFN_OFFSET.  The only trouble is if it
assumes memory to start at 0x0.

-- Dave

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