linux-kernel - Re: [PATCH] init_reap_node() initialization fix

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Message-ID: <p738xiwkwim.fsf@verdi.suse.de>
Date:	31 Oct 2006 22:25:53 +0100
From:	Andi Kleen <ak@...e.de>
To:	Daniel Yeisley <dan.yeisley@...sys.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] init_reap_node() initialization fix

Daniel Yeisley <dan.yeisley@...sys.com> writes:

> It looks like there is a bug in init_reap_node() in slab.c that can
> cause multiple oops's on certain ES7000 configurations.  The variable
> reap_node is defined per cpu, but only initialized on a single CPU.
> This causes an oops in next_reap_node() when __get_cpu_var(reap_node)
> returns the wrong value.  Fix is below.

Agreed. The cpu up call back is usually called on the BP only,
so __get_cpu_var which uses a local variable is wrong here.

-Andi
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