Commit 69a78ff2 authored May 16, 2017 by Thomas Gleixner Committed by Ingo Molnar May 23, 2017

init: Introduce SYSTEM_SCHEDULING state



might_sleep() debugging and smp_processor_id() debugging should be active
right after the scheduler starts working. The init task can invoke
smp_processor_id() from preemptible context as it is pinned on the boot cpu
until sched_smp_init() removes the pinning and lets it schedule on all non
isolated cpus.

Add a new state which allows to enable those checks earlier and add it to
the xen do_poweroff() function.

No functional change.

Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170516184736.196214622@linutronix.de


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

parent c6202adf

drivers/xen/manage.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -190,6 +190,7 @@ static void do_poweroff(void)
		{
		switch (system_state) {
		case SYSTEM_BOOTING:
		case SYSTEM_SCHEDULING:
		orderly_poweroff(true);
		break;
		case SYSTEM_RUNNING:

include/linux/kernel.h

+5 −1

Original line number	Diff line number	Diff line
		@@ -490,9 +490,13 @@ extern int root_mountflags;

		extern bool early_boot_irqs_disabled;

		/* Values used for system_state */
		/*
		* Values used for system_state. Ordering of the states must not be changed
		* as code checks for <, <=, >, >= STATE.
		*/
		extern enum system_states {
		SYSTEM_BOOTING,
		SYSTEM_SCHEDULING,
		SYSTEM_RUNNING,
		SYSTEM_HALT,
		SYSTEM_POWER_OFF,