linux-kernel - Re: [PATCH] mm/init: cpu_hotplug_init() must be initialized before SLAB

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Date:	Mon, 22 Jun 2009 20:13:08 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Sachin Sant <sachinp@...ibm.com>
Subject: Re: [PATCH] mm/init: cpu_hotplug_init() must be initialized before
 SLAB

On Tue, 2009-06-23 at 10:31 +1000, Benjamin Herrenschmidt wrote:
> SLAB uses get/put_online_cpus() which use a mutex which is itself
> only initialized when cpu_hotplug_init() is called. Currently
> we hang suring boot in SLAB due to doing that too late. This
> moves the call to cpu_hotplug_init() to before mm_init() (it
> should be safe to call that early).
> 
> This fixes boot with SLAB on some PowerPC machines.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
> 
> Sachin, James, do that fix the boot failures you've been seeing ?

Yes, that seems to fix it for me.

James


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