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x86, power, suspend: Annotate restore_processor_state() with notrace 

ftrace_stop() is used to stop function tracing during suspend and resume
which removes a lot of possible debugging opportunities with tracing.
The reason was that some function in the resume path was causing a triple
fault if it were to be traced. The issue I found was that doing something
as simple as calling smp_processor_id() would reboot the box!

When function tracing was first created I didn't have a good way to figure
out what function was having issues, or it looked to be multiple ones. To
fix it, we just created a big hammer approach to the problem which was to
add a flag in the mcount trampoline that could be checked and not call
the traced functions.

Lately I developed better ways to find problem functions and I can bisect
down to see what function is causing the issue. I removed the flag that
stopped tracing and proceeded to find the problem function and it ended
up being restore_processor_state(). This function makes sense as when the
CPU comes back online from a suspend it calls this function to set up
registers, amongst them the GS register, which stores things such as
what CPU the processor is (if you call smp_processor_id() without this
set up properly, it would fault).

By making restore_processor_state() notrace, the system can suspend and
resume without the need of the big hammer tracing to stop.

Link: http://lkml.kernel.org/r/3577662.BSnUZfboWb@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 20:58:26 -04:00 committed by Steven Rostedt
parent 1026ff9b8e
commit b8f99b3e0e
1 changed files with 2 additions and 2 deletions
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4
arch/x86/power/cpu.c
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@ -165,7 +165,7 @@ static void fix_processor_context(void)
* by __save_processor_state()
* @ctxt - structure to load the registers contents from
*/
static void __restore_processor_state(struct saved_context *ctxt)
static void notrace __restore_processor_state(struct saved_context *ctxt)
{
if (ctxt->misc_enable_saved)
wrmsrl(MSR_IA32_MISC_ENABLE, ctxt->misc_enable);
@ -239,7 +239,7 @@ static void __restore_processor_state(struct saved_context *ctxt)
}
/* Needed by apm.c */
void restore_processor_state(void)
void notrace restore_processor_state(void)
{
__restore_processor_state(&saved_context);
}