do_boot_cpu can deadlock?

[Oleg Nesterov]

Hmm. arch/x86/kernel/smpboot.c:do_boot_cpu() can deadlock ?

It is called from _cpu_up() under cpu_hotplug_begin(), and it
waits for c_idle.work. Again, if we have the pending work which
needs get_online_cpus() we seem to have problems.

Oleg.

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