linux-kernel - Re: [PATCH]Fix parsing kernelcore boot option for ia64

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Date:	Tue, 24 Apr 2007 09:26:25 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	mel@...net.ie (Mel Gorman)
Cc:	y-goto@...fujitsu.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, tony.luck@...el.com
Subject: Re: [PATCH]Fix parsing kernelcore boot option for ia64

On Mon, 23 Apr 2007 19:32:46 +0100
mel@...net.ie (Mel Gorman) wrote:

> > > I wasn't even aware of this kernelcore thing.  It's pretty nasty-looking. 
> > > yet another reminder that this code hasn't been properly reviewed in the
> > > past year or three.
> > 
> > Just now, I'm making memory-unplug patches with current MOVABLE_ZONE
> > code. So, I might be the first user of it on ia64.
> > 
> > Anyway, I'll try to fix it.
> > 
> 
> Can you review this patch and see does it fix the problem please? There
> was a second problem that showed up while testing this in relation to the
> bootmem allocator assumptions about zone boundary alignment. I'll follow up
> this mail with the patch in case you are seeing that problem.
> 
> Subject: Fix parsing kernelcore boot option V2
> cmdline_parse_kernelcore() should return the next pointer of boot option
> like memparse() doing. If not, it is cause of eternal loop on ia64 box.
> This patch is for 2.6.21-rc6-mm1. This patch changes the kernelcore command
> line parsing so that is compatible with both early_param() way of doing
> things and IA64.
> 
In my understanding, why ia64 doesn't use early_param() macro for mem= at el. is that 
it has to use mem= option at efi handling which is called before parse_early_param().

Current ia64's boot path is
 setup_arch()
    -> efi handling -> parse_early_param() -> numa handling -> pgdat/zone init

kernelcore= option is just used at pgdat/zone initialization. (no arch dependent part...)

So I think just adding
==
early_param("kernelcore",cmpdline_parse_kernelcore)
==
to ia64 is ok.....

-Kame

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