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On some systems it can take a hotplugged cpu much longer to come up than
it would at boot. If the cpu comes up after we've given up on it, it
tends to die in its first attempt to kmem_cache_alloc (uninitialized
percpu data, I imagine).
In my experimentation I haven't seen a processor take more than one
second to become available; the patch waits five seconds just to be safe.
Patch is against 2.6.7-rc2; please apply.
Signed-off-by: Nathan *** < XXXX@XXXXX.COM >