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authorThomas Gleixner <tglx@linutronix.de>2017-05-16 20:42:47 +0200
committerIngo Molnar <mingo@kernel.org>2017-05-23 10:01:38 +0200
commit69a78ff226fe0241ab6cb9dd961667be477e3cf7 (patch)
tree0492721a52622ff791f2166e4a41245e7a3550b6
parentc6202adf3a0969514299cf10ff07376a84ad09bb (diff)
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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>
-rw-r--r--drivers/xen/manage.c1
-rw-r--r--include/linux/kernel.h6
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index c1ec8ee80924..9e35032351a0 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -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:
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 13bc08aba704..1c91f26e2996 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -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,