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Sameer Nanda 45226e944c NMI watchdog: fix for lockup detector breakage on resume ... On the suspend/resume path the boot CPU does not go though an offline->online transition. This breaks the NMI detector post-resume since it depends on PMU state that is lost when the system gets suspended. Fix this by forcing a CPU offline->online transition for the lockup detector on the boot CPU during resume. To provide more context, we enable NMI watchdog on Chrome OS. We have seen several reports of systems freezing up completely which indicated that the NMI watchdog was not firing for some reason. Debugging further, we found a simple way of repro'ing system freezes -- issuing the command 'tasket 1 sh -c "echo nmilockup > /proc/breakme"' after the system has been suspended/resumed one or more times. With this patch in place, the system freeze result in panics, as expected. These panics provide a nice stack trace for us to debug the actual issue causing the freeze. [akpm@linux-foundation.org: fiddle with code comment] [akpm@linux-foundation.org: make lockup_detector_bootcpu_resume() conditional on CONFIG_SUSPEND] [akpm@linux-foundation.org: fix section errors] Signed-off-by: Sameer Nanda <snanda@chromium.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Don Zickus <dzickus@redhat.com> Cc: Mandeep Singh Baines <msb@chromium.org> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		13 years ago
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Kconfig	PM / Sleep: Separate printing suspend times from initcall_debug	13 years ago
Makefile	PM / Sleep: Add user space interface for manipulating wakeup sources, v3	13 years ago
autosleep.c	PM / Sleep: Add "prevent autosleep time" statistics to wakeup sources	13 years ago
block_io.c	block: kill off REQ_UNPLUG	14 years ago
console.c	PM / VT: Cleanup #if defined uglyness and fix compile error	13 years ago
hibernate.c	Power management updates for 3.6	13 years ago
main.c	PM / Sleep: Separate printing suspend times from initcall_debug	13 years ago
power.h	PM / Hibernate: Enable suspend to both for in-kernel hibernation.	13 years ago
poweroff.c	Input: sysrq - drop tty argument from sysrq ops handlers	15 years ago
process.c	PM / Sleep: Mitigate race between the freezer and request_firmware()	13 years ago
qos.c	PM / QoS: add pm_qos_update_request_timeout() API	13 years ago
snapshot.c	Power management updates for 3.4	13 years ago
suspend.c	NMI watchdog: fix for lockup detector breakage on resume	13 years ago
suspend_test.c	…
swap.c	PM / Hibernate: Print hibernation/thaw progress indicator one line at a time.	13 years ago
user.c	Make wait_for_device_probe() also do scsi_complete_async_scans()	13 years ago
wakelock.c	PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock	13 years ago