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SubjectRe: [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 <>
> ---
> Sachin, James, do that fix the boot failures you've been seeing ?

Yes, that seems to fix it for me.


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