61 lines
2.0 KiB
Diff
61 lines
2.0 KiB
Diff
From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 16 May 2017 20:42:47 +0200
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Subject: [PATCH 16/17] init: Introduce SYSTEM_SCHEDULING state
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.9-rt7.tar.xz
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might_sleep() debugging and smp_processor_id() debugging should be active
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right after the scheduler starts working. The init task can invoke
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smp_processor_id() from preemptible context as it is pinned on the boot cpu
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until sched_smp_init() removes the pinning and lets it schedule on all non
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isolated cpus.
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Add a new state which allows to enable those checks earlier and add it to
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the xen do_poweroff() function.
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No functional change.
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Tested-by: Mark Rutland <mark.rutland@arm.com>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Acked-by: Mark Rutland <mark.rutland@arm.com>
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Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Cc: Juergen Gross <jgross@suse.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Steven Rostedt <rostedt@goodmis.org>
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Link: http://lkml.kernel.org/r/20170516184736.196214622@linutronix.de
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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---
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drivers/xen/manage.c | 1 +
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include/linux/kernel.h | 6 +++++-
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2 files changed, 6 insertions(+), 1 deletion(-)
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--- a/drivers/xen/manage.c
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+++ b/drivers/xen/manage.c
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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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--- a/include/linux/kernel.h
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+++ b/include/linux/kernel.h
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@@ -488,9 +488,13 @@ 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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