Commit fac1c204 authored Sep 20, 2017 by Peter Zijlstra Committed by Thomas Gleixner Sep 25, 2017

smp/hotplug: Add state diagram



Add a state diagram to clarify when which states are ran where.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: bigeasy@linutronix.de
Cc: efault@gmx.de
Cc: rostedt@goodmis.org
Cc: max.byungchul.park@gmail.com
Link: https://lkml.kernel.org/r/20170920170546.661598270@infradead.org

parent e19b205b

include/linux/cpuhotplug.h

+18 −0

Original line number	Diff line number	Diff line
		@@ -3,6 +3,24 @@

		#include <linux/types.h>

		/*
		* CPU-up CPU-down
		*
		* BP AP BP AP
		*
		* OFFLINE OFFLINE
		* \| ^
		* v \|
		* BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead)
		* \| AP_OFFLINE
		* v (IRQ-off) ,---------------^
		* AP_ONLNE \| (stop_machine)
		* \| TEARDOWN_CPU <- AP_ONLINE_IDLE
		* \| ^
		* v \|
		* AP_ACTIVE AP_ACTIVE
		*/

		enum cpuhp_state {
		CPUHP_OFFLINE,
		CPUHP_CREATE_THREADS,