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init: Introduce SYSTEM_SCHEDULING state

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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>
This commit is contained in:
Thomas Gleixner 2017-05-16 20:42:47 +02:00 committed by Ingo Molnar
parent c6202adf3a
commit 69a78ff226
2 changed files with 6 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/xen/manage.c
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@ -190,6 +190,7 @@ static void do_poweroff(void)
{ {
switch (system_state) { switch (system_state) {
case SYSTEM_BOOTING: case SYSTEM_BOOTING:
case SYSTEM_SCHEDULING:
orderly_poweroff(true); orderly_poweroff(true);
break; break;
case SYSTEM_RUNNING: case SYSTEM_RUNNING:

6
include/linux/kernel.h
View file

@ -490,9 +490,13 @@ extern int root_mountflags;
extern bool early_boot_irqs_disabled; 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 { extern enum system_states {
SYSTEM_BOOTING, SYSTEM_BOOTING,
SYSTEM_SCHEDULING,
SYSTEM_RUNNING, SYSTEM_RUNNING,
SYSTEM_HALT, SYSTEM_HALT,
SYSTEM_POWER_OFF, SYSTEM_POWER_OFF,