linux-kernel - Re: [patch 2/2] x86: move prefill_possible

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Message-ID: <20080930075353.GA20241@elte.hu>
Date:	Tue, 30 Sep 2008 09:53:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [patch 2/2] x86: move prefill_possible_map calling early, fix,
	V2


* Chuck Ebbert <cebbert@...hat.com> wrote:

> From: Chuck Ebbert <cebbert@...hat.com>
> 
> x86: move prefill_possible_map calling early, fix, V2
> 
> fix:
> 
> arch/x86/kernel/built-in.o: In function `setup_arch':
> : undefined reference to `prefill_possible_map'
> 
> Fix this by making prefill_possible_map() available even when
> CONFIG_HOTPLUG_CPU is not set. The function is needed so that
> the number of possible CPUs can be determined.
> 
> Tested on uniprocessor machine with CPU hotplug disabled.
> From boot log:
> Before: NR_CPUS: 512, nr_cpu_ids: 512, nr_node_ids 1
> After: NR_CPUS: 512, nr_cpu_ids: 1, nr_node_ids 1

applied to tip/x86/core, thanks Chuck! Made it a single delta patch, to 
ease backporting.

	Ingo
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