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>		2012-07-30 17:25:13 -07:00
..
debug	kdb: Switch to nolock variants of kmsg_dump functions	2012-07-21 10:34:00 -07:00
events	perf: Introduce perf_pmu_migrate_context()	2012-06-18 12:13:21 +02:00
gcov
irq	Devicetree updates for 3.6	2012-07-24 14:07:22 -07:00
power	NMI watchdog: fix for lockup detector breakage on resume	2012-07-30 17:25:13 -07:00
sched	sched: Fix race in task_group()	2012-07-24 13:58:20 +02:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-07-22 11:35:46 -07:00
trace	Staging tree patches for 3.6-rc1	2012-07-26 11:14:49 -07:00
.gitignore
acct.c
async.c	[SCSI] async: make async_synchronize_full() flush all work regardless of domain	2012-07-20 09:07:37 +01:00
audit.c	netlink: add netlink_kernel_cfg parameter to netlink_kernel_create	2012-06-29 16:46:02 -07:00
audit.h
audit_tree.c	VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors	2012-07-14 16:37:27 +04:00
audit_watch.c	get rid of kern_path_parent()	2012-07-14 16:35:02 +04:00
auditfilter.c
auditsc.c	seccomp: remove duplicated failure logging	2012-04-14 11:13:20 +10:00
backtracetest.c
bounds.c
capability.c	userns: Teach inode_capable to understand inodes whose uids map to other namespaces.	2012-05-15 14:59:24 -07:00
cgroup.c	Merge branch 'for-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-07-24 17:47:44 -07:00
cgroup_freezer.c
compat.c	new helper: sigsuspend()	2012-05-21 23:52:30 -04:00
configs.c
cpu.c	kernel/cpu.c: document clear_tasks_mm_cpumask()	2012-05-31 17:49:30 -07:00
cpu_pm.c	kernel/cpu_pm.c: fix various typos	2012-05-31 17:49:27 -07:00
cpuset.c	cpusets: Remove/update outdated comments	2012-07-24 13:53:28 +02:00
crash_dump.c
cred.c	keys: kill task_struct->replacement_session_keyring	2012-05-23 22:11:41 -04:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	posix_types.h: Cleanup stale __NFDBITS and related definitions	2012-07-26 13:36:43 -07:00
extable.c	extable: Skip sorting if sorted at build time.	2012-04-19 15:06:55 -07:00
fork.c	Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-07-23 12:27:27 -07:00
freezer.c
futex.c
futex_compat.c
groups.c	userns: Convert in_group_p and in_egroup_p to use kgid_t	2012-05-03 03:29:33 -07:00
hrtimer.c	hrtimer: Update hrtimer base offsets each hrtimer_interrupt	2012-07-11 23:34:39 +02:00
hung_task.c	hung task debugging: Inject NMI when hung and going to panic	2012-04-25 12:39:25 +02:00
irq_work.c	irq_work: fix compile failure on tile from missing include	2012-04-13 13:15:16 -04:00
itimer.c	itimer: Use printk_once instead of WARN_ONCE	2012-04-10 11:00:30 +02:00
jump_label.c
kallsyms.c	vsprintf: fix %ps on non symbols when using kallsyms	2012-05-29 16:22:32 -07:00
kcmp.c	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c
kfifo.c	[media] kernel:kfifo: export __kfifo_max_r symbol	2012-04-11 18:24:37 -03:00
kmod.c	kmod.c: fix kernel-doc warning	2012-05-31 17:49:28 -07:00
kprobes.c
ksysfs.c
kthread.c	kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed	2012-07-22 10:15:28 -07:00
latencytop.c
lglock.c	brlocks/lglocks: turn into functions	2012-05-29 23:28:41 -04:00
lockdep.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-06-01 10:34:35 -07:00
module.c	Guard check in module loader against integer overflow	2012-05-23 22:28:53 +09:30
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c	panic: fix a possible deadlock in panic()	2012-07-30 17:25:13 -07:00
params.c	params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)	2012-05-04 17:28:18 -07:00
pid.c	mm: add a low limit to alloc_large_system_hash	2012-05-24 00:28:21 -04:00
pid_namespace.c	pidns: guarantee that the pidns init will be the last pidns process reaped	2012-06-20 14:39:36 -07:00
posix-cpu-timers.c
posix-timers.c
printk.c	Driver core merge for 3.6-rc1	2012-07-26 11:25:33 -07:00
profile.c
ptrace.c	userns: Convert ptrace, kill, set_priority permission checks to work with kuids and kgids	2012-05-03 03:28:51 -07:00
range.c
rcu.h
rcupdate.c	rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations	2012-07-02 12:34:23 -07:00
rcutiny.c	rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU	2012-07-02 12:34:25 -07:00
rcutiny_plugin.h	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutorture.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
rcutree.c	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutree.h	Merge branches 'bigrtm.2012.07.04a', 'doctorture.2012.07.02a', 'fixes.2012.07.06a' and 'fnh.2012.07.02a' into HEAD	2012-07-06 05:59:30 -07:00
rcutree_plugin.h	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutree_trace.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
relay.c	splice: fix racy pipe->buffers uses	2012-06-13 21:16:42 +02:00
res_counter.c	rescounters: add res_counter_uncharge_until()	2012-05-29 16:22:27 -07:00
resource.c	resources: allow adjust_resource() for resources with no parent	2012-06-13 15:42:22 -06:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
seccomp.c	seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER	2012-04-18 12:24:52 +10:00
semaphore.c
signal.c	signal: make sure we don't get stopped with pending task_work	2012-07-22 23:57:54 +04:00
smp.c	smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()	2012-06-05 17:27:14 +02:00
smpboot.c	smpboot, idle: Fix comment mismatch over idle_threads_init()	2012-05-24 22:58:08 +02:00
smpboot.h	smpboot: Remove leftover declaration	2012-06-11 15:07:52 +02:00
softirq.c
spinlock.c
srcu.c	rcu: Implement per-domain single-threaded call_srcu() state machine	2012-04-30 10:48:25 -07:00
stacktrace.c
stop_machine.c
sys.c	prctl: remove redunant assignment of "error" to zero	2012-07-30 17:25:11 -07:00
sys_ni.c	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
sysctl.c	coredump: warn about unsafe suid_dumpable / core_pattern combo	2012-07-30 17:25:11 -07:00
sysctl_binary.c	ipv4: Don't add deprecated new binary sysctl value.	2012-06-22 23:02:22 -07:00
task_work.c	deal with task_work callbacks adding more work	2012-07-22 23:57:57 +04:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c	timers: Improve get_next_timer_interrupt()	2012-06-06 13:49:02 +02:00
tracepoint.c
tsacct.c
uid16.c	userns: Convert setting and getting uid and gid system calls to use kuid and kgid	2012-05-03 03:28:41 -07:00
up.c
user-return-notifier.c
user.c	userns: Silence silly gcc warning.	2012-05-19 15:44:40 -06:00
user_namespace.c	userns: Store uid and gid values in struct cred with kuid_t and kgid_t types	2012-05-03 03:28:38 -07:00
utsname.c	userns: Use cred->user_ns instead of cred->user->user_ns	2012-04-07 16:55:51 -07:00
utsname_sysctl.c
wait.c
watchdog.c	NMI watchdog: fix for lockup detector breakage on resume	2012-07-30 17:25:13 -07:00
workqueue.c	workqueue: fix spurious CPU locality WARN from process_one_work()	2012-07-22 10:16:34 -07:00
workqueue_sched.h