linux-kernel - Re: [PATCH] memory hotadd fixes [4/5] avoid check in acpi

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Message-Id: <20060804133210.fffaa276.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 4 Aug 2006 13:32:10 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	kmannth@...ibm.com
Cc:	linux-kernel@...r.kernel.org, lhms-devel@...ts.sourceforge.net,
	y-goto@...fujitsu.com, akpm@...l.org
Subject: Re: [PATCH] memory hotadd fixes [4/5] avoid check in acpi

On Thu, 03 Aug 2006 21:25:34 -0700
keith mannthey <kmannth@...ibm.com> wrote:

> On Fri, 2006-08-04 at 12:48 +0900, KAMEZAWA Hiroyuki wrote:
> > On Thu, 03 Aug 2006 20:23:46 -0700
> > keith mannthey <kmannth@...ibm.com> wrote:
> 
> > > > > What keeps 0xa0000000 to 0xa1000000 from being re-onlined by a bad call
> > > > > to add_memory?
> > > > 
> > > > Usual sparsemem's add_memory() checks whether there are sections in
> > > > sparse_add_one_section(). then add_pages() returns -EEXIST (nothing to do).
> > > > And ioresouce collision check will finally find collision because 0-0xbffffff
> > > > resource will conflict with 0xa0000000 to 0xa10000000 area.
> > > > But, x86_64 's (not sparsemem) add_pages() doen't do collision check, so it panics.
> > > 
> > > I have paniced with your 5 patches while doing SPARSMEM....  I think
> > > your 6th patch address the issues I was seeing.  
> > > 
> 
> 
> with the 6 patches things work as expected.  It is nice to have the
> sysfs devices online the correct amount of memory.  
> 
> I was broken without this patch because invalid add_memory calls are
> made on by box (yet another issue) during boot. 
> 
> I will build my patch set on top of your 6 patches. 
> 

Okay, thank you very much !

-Kame

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