Re: [PATCH] Booting when CPUs fail to come up.

[Pavel Machek]

Hi!

> I recently played with setting a bit in cpu_possible_map that wasn't
> in cpu_online_map: this can happen without hotplug CPU when a CPU
> fails to boot, for example.
> 
> 1) i386 should use cpu_callin_map for num_booting_cpus() (an x86-ism
>    anyway): if a CPU doesn't come up, it will be set in
>    cpu_possible_map (aka cpu_callout_map) but not cpu_callin_map.
> 
> 2) When the cpu fails to come up, some callbacks do kthread_stop(),
>    which doesn't work without keventd (which hasn't started yet).
>    Call it directly, and take care that it restores signal state
>    (note: do_sigaction does a flush on blocked signals, so we don't
>    need to repeat it).

Is it safe to continue when one cpu is apparently malfunctioning?

								Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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