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PM / Sleep: Remove ftrace_stop/start() from suspend and hibernate

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ftrace_stop() and ftrace_start() were added to the suspend and hibernate
process because there was some function within the work flow that caused
the system to reboot if it was traced. This function has recently been
found (restore_processor_state()). Now there's no reason to disable
function tracing while we are going into suspend or hibernate, which means
that being able to trace this will help tremendously in debugging any
issues with suspend or hibernate.

This also means that the ftrace_stop/start() functions can be removed
and simplify the function tracing code a bit.

Link: http://lkml.kernel.org/r/1518201.VD9cU33jRU@vostro.rjw.lan

Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-06-24 23:38:08 -04:00
committed by Steven Rostedt
parent b8f99b3e0e
commit 2b014666a1
2 changed files with 0 additions and 8 deletions
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2
kernel/power/suspend.c
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@@ -248,7 +248,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
goto Platform_wake;
}
ftrace_stop();
error = disable_nonboot_cpus();
if (error || suspend_test(TEST_CPUS))
goto Enable_cpus;
@@ -275,7 +274,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
Enable_cpus:
enable_nonboot_cpus();
ftrace_start();
Platform_wake:
if (need_suspend_ops(state) && suspend_ops->wake)