Steven Rostedt f42ac38c59 ftrace: disable tracing for suspend to ram ... I've been painstakingly debugging the issue with suspend to ram and ftraced. The 2.6.28 code does not have this issue, but since the mcount recording is not going to be in 27, this must be solved for the ftrace daemon version. The resume from suspend to ram would reboot because it was triple faulting. Debugging further, I found that calling the mcount function itself was not an issue, but it would fault when it incremented preempt_count. preempt_count is on the tasks info structure that is on the low memory address of the task's stack. For some reason, it could not write to it. Resuming out of suspend to ram does quite a lot of funny tricks to get to work, so it is not surprising at all that simply doing a preempt_disable() would cause a fault. Thanks to Rafael for suggesting to add a "while (1);" to find the place in resuming that is causing the fault. I would place the loop somewhere in the code, compile and reboot and see if it would either reboot (hit the fault) or simply hang (hit the loop). Doing this over and over again, I narrowed it down that it was happening in enable_nonboot_cpus. At this point, I found that it is easier to simply disable tracing around the suspend code, instead of searching for the particular function that can not handle doing a preempt_disable. This patch disables the tracer as it suspends and reenables it on resume. I tested this patch on my Laptop, and it can resume fine with the patch. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-08-27 13:54:20 -07:00
..
irq	genirq: switch /proc/irq/*/smp_affinity et al to seqfiles	2008-08-12 16:07:30 -07:00
power	ftrace: disable tracing for suspend to ram	2008-08-27 13:54:20 -07:00
time	nohz: fix wrong event handler after online an offlined cpu	2008-08-21 09:54:06 +02:00
trace	Merge branch 'linus' into cpus4096	2008-07-28 23:32:00 +02:00
.gitignore	…
Kconfig.hz	sched: fix SCHED_HRTICK dependency	2008-07-28 14:37:38 +02:00
Kconfig.preempt	…
Makefile	Merge branch 'linus' into core/generic-dma-coherent	2008-07-29 00:07:55 +02:00
acct.c	bsdacct: fix and add comments around acct_process()	2008-07-25 10:53:47 -07:00
audit.c	[PATCH] Fix the bug of using AUDIT_STATUS_RATE_LIMIT when set fail, no error output.	2008-08-01 12:15:16 -04:00
audit.h	…
audit_tree.c	…
auditfilter.c	Re: [PATCH] the loginuid field should be output in all AUDIT_CONFIG_CHANGE audit messages	2008-08-01 12:15:03 -04:00
auditsc.c	Re: [PATCH] Fix the kernel panic of audit_filter_task when key field is set	2008-08-04 06:13:50 -04:00
backtracetest.c	backtrace: replace timer with tasklet + completions	2008-06-27 18:09:16 +02:00
bounds.c	…
capability.c	security: Fix setting of PF_SUPERPRIV by __capable()	2008-08-14 22:59:43 +10:00
cgroup.c	cgroup: uninline cgroup_has_css_refs()	2008-07-30 09:41:44 -07:00
cgroup_debug.c	…
compat.c	…
configs.c	…
cpu.c	cpu hotplug: s390 doesn't support additional_cpus anymore.	2008-08-12 16:07:28 -07:00
cpuset.c	cpuset: clean up cpuset hierarchy traversal code	2008-07-30 09:41:44 -07:00
delayacct.c	per-task-delay-accounting: update taskstats for memory reclaim delay	2008-07-25 10:53:47 -07:00
dma-coherent.c	DMA: make dma-coherent.c documentation kdoc-friendly	2008-08-07 06:52:01 -07:00
dma.c	…
exec_domain.c	[PATCH] kill altroot	2008-07-26 20:53:20 -04:00
exit.c	tracehook: fix exit_signal=0 case	2008-08-01 12:01:11 -07:00
extable.c	…
fork.c	mmu-notifiers: core	2008-07-28 16:30:21 -07:00
futex.c	futexes: fix fault handling in futex_lock_pi	2008-06-23 13:31:15 +02:00
futex_compat.c	…
hrtimer.c	Merge branch 'generic-ipi' into generic-ipi-for-linus	2008-07-15 21:55:59 +02:00
itimer.c	…
kallsyms.c	kallsyms: fix potential overflow in binary search	2008-07-25 10:53:27 -07:00
kexec.c	kexec: use a mutex for locking rather than xchg()	2008-08-15 08:35:43 -07:00
kfifo.c	…
kgdb.c	kgdb: fix gdb serial thread queries	2008-08-01 08:39:35 -05:00
kmod.c	call_usermodehelper(): increase reliability	2008-07-25 10:53:28 -07:00
kprobes.c	kprobes: remove redundant config check	2008-07-25 10:53:30 -07:00
ksysfs.c	…
kthread.c	tracehook: wait_task_inactive	2008-07-26 12:00:09 -07:00
latencytop.c	…
lockdep.c	lockdep: fix spurious 'inconsistent lock state' warning	2008-08-18 09:42:31 +02:00
lockdep_internals.h	lockdep: build fix	2008-08-13 12:55:10 +02:00
lockdep_proc.c	lockdep: fix build if CONFIG_PROVE_LOCKING not defined	2008-08-15 19:22:04 +02:00
marker.c	markers: fix markers read barrier for multiple probes	2008-07-30 09:41:45 -07:00
module.c	[module] Don't let gcc inline load_module()	2008-08-25 11:10:26 -07:00
mutex-debug.c	…
mutex-debug.h	…
mutex.c	locking: fix mutex @key parameter kernel-doc notation	2008-07-28 18:12:36 +02:00
mutex.h	…
notifier.c	…
ns_cgroup.c	cgroup_clone: use pid of newly created task for new cgroup	2008-07-25 10:53:37 -07:00
nsproxy.c	removed unused #include <linux/version.h>'s	2008-08-23 12:14:12 -07:00
panic.c	Add a WARN() macro; this is WARN_ON() + printk arguments	2008-07-25 10:53:29 -07:00
params.c	…
pid.c	pidns: remove now unused find_pid function.	2008-07-25 10:53:45 -07:00
pid_namespace.c	bsdacct: switch from global bsd_acct_struct instance to per-pidns one	2008-07-25 10:53:47 -07:00
pm_qos_params.c	pm_qos: spelling fixes	2008-08-05 14:33:50 -07:00
posix-cpu-timers.c	…
posix-timers.c	Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-08-11 16:46:11 -07:00
printk.c	printk: fix comment for printk ratelimiting	2008-07-30 09:41:45 -07:00
profile.c	build kernel/profile.o only when requested	2008-07-25 10:53:27 -07:00
ptrace.c	security: Fix setting of PF_SUPERPRIV by __capable()	2008-08-14 22:59:43 +10:00
rcuclassic.c	stop_machine: Wean existing callers off stop_machine_run()	2008-07-28 12:16:31 +10:00
rcupdate.c	rcu: fix synchronize_rcu() so that kernel-doc works	2008-08-21 09:31:44 +02:00
rcupreempt.c	Merge branch 'linus' into cpus4096	2008-07-16 00:29:07 +02:00
rcupreempt_trace.c	…
rcutorture.c	rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)	2008-06-26 09:24:33 +02:00
relay.c	relay: fix "full buffer with exactly full last subbuffer" accounting problem	2008-08-05 14:33:46 -07:00
res_counter.c	cgroup files: convert res_counter_write() to be a cgroups write_string() handler	2008-07-25 10:53:36 -07:00
resource.c	resource: add resource_size()	2008-07-30 09:41:43 -07:00
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	sysdev: Pass the attribute to the low level sysdev show/store function	2008-07-21 21:55:02 -07:00
rtmutex.c	…
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-08-16 17:15:32 -07:00
sched_clock.c	sched_clock: fix cpu_clock()	2008-08-25 17:39:57 +02:00
sched_cpupri.c	…
sched_cpupri.h	…
sched_debug.c	sched: add full schedstats to /proc/sched_debug	2008-06-27 14:31:31 +02:00
sched_fair.c	sched: fix mysql+oltp regression	2008-08-11 14:49:29 +02:00
sched_features.h	sched: enable LB_BIAS by default	2008-08-21 08:18:02 +02:00
sched_idletask.c	…
sched_rt.c	sched: fix rt-bandwidth hotplug race	2008-08-14 15:50:58 +02:00
sched_stats.h	sched: fix accounting in task delay accounting & migration	2008-07-04 12:50:23 +02:00
seccomp.c	…
semaphore.c	semaphore: __down_common: use signal_pending_state()	2008-08-05 14:33:47 -07:00
signal.c	tracehook: fix SA_NOCLDWAIT	2008-08-19 20:37:07 -07:00
smp.c	generic-ipi: fix stack and rcu interaction bug in smp_call_function_mask(), fix	2008-08-12 11:21:27 +02:00
softirq.c	Full conversion to early_initcall() interface, remove old interface	2008-07-26 12:00:04 -07:00
softlockup.c	Full conversion to early_initcall() interface, remove old interface	2008-07-26 12:00:04 -07:00
spinlock.c	lockdep: spin_lock_nest_lock(), checkpatch fixes	2008-08-13 13:56:51 +02:00
srcu.c	…
stacktrace.c	stacktrace: fix modular build, export print_stack_trace and save_stack_trace	2008-06-30 09:20:55 +02:00
stop_machine.c	stop_machine: remove unused variable	2008-08-12 17:52:55 +10:00
sys.c	fix setpriority(PRIO_PGRP) thread iterator breakage	2008-08-20 15:40:32 -07:00
sys_ni.c	signalfd: fix undefined reference to `compat_sys_signalfd4' when !CONFIG_SIGNALFD	2008-07-25 11:35:41 -07:00
sysctl.c	lost sysctl fix	2008-07-27 09:45:34 -07:00
sysctl_check.c	sysctl: check for bogus modes	2008-07-25 10:53:45 -07:00
taskstats.c	taskstats: remove initialization of static per-cpu variable	2008-07-25 10:53:47 -07:00
test_kprobes.c	…
time.c	…
timeconst.pl	…
timer.c	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2008-07-14 16:06:58 -07:00
tsacct.c	task IO accounting: move all IO statistics in struct task_io_accounting	2008-07-27 16:12:28 -07:00
uid16.c	…
user.c	…
user_namespace.c	removed unused #include <linux/version.h>'s	2008-08-23 12:14:12 -07:00
utsname.c	removed unused #include <linux/version.h>'s	2008-08-23 12:14:12 -07:00
utsname_sysctl.c	removed unused #include <linux/version.h>'s	2008-08-23 12:14:12 -07:00
wait.c	…
workqueue.c	Merge branch 'core/locking' into core/urgent	2008-08-12 00:11:49 +02:00