pstore: Switch pmsg_lock to an rt_mutex to avoid priority inversion

Wei Wang reported seeing priority inversion caused latencies
caused by contention on pmsg_lock, and suggested it be switched
to a rt_mutex.

I was initially hesitant this would help, as the tasks in that
trace all seemed to be SCHED_NORMAL, so the benefit would be
limited to only nice boosting.

However, another similar issue was raised where the priority
inversion was seen did involve a blocked RT task so it is clear
this would be helpful in that case.

Cc: Wei Wang <>
Cc: Midas Chien<>
Cc: Connor O'Brien <>
Cc: Kees Cook <>
Cc: Anton Vorontsov <>
Cc: Colin Cross <>
Cc: Tony Luck <>
Fixes: 9d5438f462ab ("pstore: Add pmsg - user-space accessible pstore object")
Reported-by: Wei Wang <>
Signed-off-by: John Stultz <>
Signed-off-by: Kees Cook <>
1 file changed