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Srivatsa S. Bhat 31b1c08507 ftrace: Disable function tracing during suspend/resume and hibernation, again 
commit 443772d408 upstream.

If function tracing is enabled for some of the low-level suspend/resume
functions, it leads to triple fault during resume from suspend, ultimately
ending up in a reboot instead of a resume (or a total refusal to come out
of suspended state, on some machines).

This issue was explained in more detail in commit f42ac38c59 (ftrace:
disable tracing for suspend to ram). However, the changes made by that commit
got reverted by commit cbe2f5a6e8 (tracing: allow tracing of
suspend/resume & hibernation code again). So, unfortunately since things are
not yet robust enough to allow tracing of low-level suspend/resume functions,
suspend/resume is still broken when ftrace is enabled.

So fix this by disabling function tracing during suspend/resume & hibernation.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-09 08:27:35 -07:00
..
block_io.c block: kill off REQ_UNPLUG 2011-03-10 08:52:27 +01:00
console.c vt: introduce and use vt_kmsg_redirect() function 2009-12-15 08:53:28 -08:00
hibernate.c ftrace: Disable function tracing during suspend/resume and hibernation, again 2012-08-09 08:27:35 -07:00
Kconfig PM: Remove CONFIG_PM_VERBOSE 2011-05-17 23:25:10 +02:00
main.c PM / Hibernate: Add sysfs knob to control size of memory for drivers 2011-05-17 23:19:19 +02:00
Makefile kernel: change to new flag variable 2011-03-17 14:02:54 +01:00
power.h PM / Hibernate: Add sysfs knob to control size of memory for drivers 2011-05-17 23:19:19 +02:00
poweroff.c Input: sysrq - drop tty argument from sysrq ops handlers 2010-08-19 22:07:06 -07:00
process.c workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable' 2011-02-16 17:48:59 +01:00
snapshot.c PM / Hibernate: Fix free_unnecessary_pages() 2011-07-06 20:15:23 +02:00
suspend.c ftrace: Disable function tracing during suspend/resume and hibernation, again 2012-08-09 08:27:35 -07:00
suspend_test.c PM: Make warning in suspend_test_finish() less likely to happen 2009-10-22 08:23:45 +09:00
swap.c Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block 2011-01-13 10:45:01 -08:00
user.c PM: Free memory bitmaps if opening /dev/snapshot fails 2011-06-21 23:20:06 +02:00