linux-kernel - Re: [PATCH] x86-64: fix 1:1 mapping init (hotplug case)

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Message-ID: <20080822055437.GA14110@elte.hu>
Date:	Fri, 22 Aug 2008 07:54:37 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [PATCH] x86-64: fix 1:1 mapping init (hotplug case)


* Jan Beulich <jbeulich@...ell.com> wrote:

> While I don't have a hotplug capable system at hand, I think two issues need
> fixing:
> - pud_phys (in kernel_physical_ampping_init()) would remain uninitialized in
>   the after_bootmem case
> - the locking done just around phys_pmd_{init,update}() would leave out pgd
>   updates, and it was needlessly covering code portions that do allocations
>   (perhaps using a more friendly gfp value in alloc_low_page() would then be
>   possible)

applied to tip/x86/urgent. Some sort of memory hotplug simulation debug 
code would be nice ... [bonus points for making it run automatically 
during bootup, as part of the kernel init code]

it wouldnt even be all that expensive to test: we'd parts of RAM as 
to-be-hotplugged, we'd boot in and then hot-add those ranges. It's not 
full unrestricted RAM in the classic sense, but for most practical 
purposes it would be that.

	Ingo
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