Commit 6a4e2451 authored Jul 13, 2016 by Thomas Gleixner Committed by Ingo Molnar Jul 14, 2016

cpu/hotplug: Handle early registration gracefully



We switched the hotplug machinery to smpboot threads. Early registration of
hotplug callbacks, i.e. from do_pre_smp_initcalls(), happens before the
threads are initialized. Instead of moving the thread init, we simply handle
it in the hotplug code itself and invoke the function directly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153332.896450738@linutronix.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent e877bde2

kernel/cpu.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -517,6 +517,13 @@ static int cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state,
		if (!cpu_online(cpu))
		return 0;

		/*
		* If we are up and running, use the hotplug thread. For early calls
		* we invoke the thread function directly.
		*/
		if (!st->thread)
		return cpuhp_invoke_callback(cpu, state, cb);

		st->cb_state = state;
		st->cb = cb;
		/*