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* [patch V2 00/17] init: Enable might_sleep() and smp_processor_id() debugging early
@ 2017-05-16 18:42 Thomas Gleixner
  2017-05-16 18:42 ` [patch V2 01/17] init: Pin init task to boot cpu initially Thomas Gleixner
                   ` (17 more replies)
  0 siblings, 18 replies; 57+ messages in thread
From: Thomas Gleixner @ 2017-05-16 18:42 UTC (permalink / raw)
  To: LKML
  Cc: Peter Zijlstra, Ingo Molnar, Steven Rostedt, Mark Rutland,
	Greg Kroah-Hartman

We recentlty discovered a call path which takes a mutex from the low level
secondary CPU bringup code and wondered why this was not caught by
might_sleep().

The reason is that both debug facilities depend on system_state ==
SYSTEM_RUNNING, which is set after init memory is freed.

That means that SMP bootup and builtin driver initialization are not
covered by these checks at all.

The patch series addresses this by adding an intermediate state which
enables both debug features right when scheduling starts, i.e. the boot CPU
idle task schedules the first time.

Changes since V1:
	- Use only one new state
	- Enable both debug facilities right before scheduling starts
	- Add more commentry about state ordering and placement of the
          state switch
	- CC ACPI folks on the relevant patch and amend changelog.
	- Collected acks/reviewed-by's

Thanks,

	tglx

^ permalink raw reply	[flat|nested] 57+ messages in thread

end of thread, other threads:[~2017-05-23  9:03 UTC | newest]

Thread overview: 57+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-05-16 18:42 [patch V2 00/17] init: Enable might_sleep() and smp_processor_id() debugging early Thomas Gleixner
2017-05-16 18:42 ` [patch V2 01/17] init: Pin init task to boot cpu initially Thomas Gleixner
2017-05-16 19:06   ` Steven Rostedt
2017-05-23  8:47   ` [tip:sched/core] init: Pin init task to the boot CPU, initially tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 02/17] arm: Adjust system_state check Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-23  8:48   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 03/17] arm64: " Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-17 10:09   ` Mark Rutland
2017-05-17 10:09     ` Mark Rutland
2017-05-17 14:23   ` Catalin Marinas
2017-05-17 14:23     ` Catalin Marinas
2017-05-23  8:48   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 04/17] x86/smp: " Thomas Gleixner
2017-05-23  8:49   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 05/17] metag: " Thomas Gleixner
2017-05-23  8:50   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 06/17] powerpc: " Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-23  8:50   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 07/17] ACPI: " Thomas Gleixner
2017-05-16 19:07   ` Steven Rostedt
2017-05-23  8:51   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 08/17] mm: " Thomas Gleixner
2017-05-23  8:51   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 09/17] cpufreq/pasemi: " Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-23  8:52   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 10/17] iommu/vt-d: Adjust system_state checks Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-23  8:52   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 11/17] iommu/of: Adjust system_state check Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-23  8:53   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 12/17] async: Adjust system_state checks Thomas Gleixner
2017-05-23  8:53   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 13/17] extable: " Thomas Gleixner
2017-05-23  8:54   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 14/17] printk: " Thomas Gleixner
2017-05-23  8:55   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 15/17] mm/vmscan: " Thomas Gleixner
2017-05-16 18:42   ` Thomas Gleixner
2017-05-17  6:56   ` Vlastimil Babka
2017-05-17  6:56     ` Vlastimil Babka
2017-05-23  8:55   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 16/17] init: Introduce SYSTEM_SCHEDULING state Thomas Gleixner
2017-05-17 10:58   ` Mark Rutland
2017-05-17 21:15   ` Boris Ostrovsky
2017-05-23  8:56   ` [tip:sched/core] " tip-bot for Thomas Gleixner
2017-05-16 18:42 ` [patch V2 17/17] sched: Enable might_sleep() and smp_processor_id() checks early Thomas Gleixner
2017-05-16 19:12   ` Steven Rostedt
2017-05-16 22:46     ` Thomas Gleixner
2017-05-16 22:50       ` Steven Rostedt
2017-05-17 11:02   ` Mark Rutland
2017-05-23  8:56   ` [tip:sched/core] sched/core: " tip-bot for Thomas Gleixner
2017-05-17 10:58 ` [patch V2 00/17] init: Enable might_sleep() and smp_processor_id() debugging early Mark Rutland

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