context_tracking: Restore previous state in schedule_user
It appears that some SCHEDULE_USER (asm for schedule_user) callers
in arch/x86/kernel/entry_64.S are called from RCU kernel context,
and schedule_user will return in RCU user context. This causes RCU
warnings and possible failures.
This is intended to be a minimal fix suitable for 3.18.
Reported-and-tested-by: Dave Jones <firstname.lastname@example.org>
Cc: Oleg Nesterov <email@example.com>
Cc: Frédéric Weisbecker <firstname.lastname@example.org>
Acked-by: Paul E. McKenney <email@example.com>
Signed-off-by: Andy Lutomirski <firstname.lastname@example.org>
Signed-off-by: Linus Torvalds <email@example.com>
1 file changed