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>
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@ -190,6 +190,7 @@ static void do_poweroff(void)
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{
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switch (system_state) {
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case SYSTEM_BOOTING:
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case SYSTEM_SCHEDULING:
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orderly_poweroff(true);
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break;
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case SYSTEM_RUNNING:
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@ -490,9 +490,13 @@ extern int root_mountflags;
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extern bool early_boot_irqs_disabled;
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/* Values used for system_state */
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/*
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* Values used for system_state. Ordering of the states must not be changed
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* as code checks for <, <=, >, >= STATE.
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*/
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extern enum system_states {
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SYSTEM_BOOTING,
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SYSTEM_SCHEDULING,
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SYSTEM_RUNNING,
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SYSTEM_HALT,
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SYSTEM_POWER_OFF,
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