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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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