sched: Exclude CPU boot code from PF_IDLE area
The commit:
cff9b2332ab7 ("kernel/sched: Modify initial boot task idle setup")
has changed the semantics of what is to be considered an idle task in
such a way that only the actual idle loop is accounted as PF_IDLE. The
intent is to exclude the CPU boot code from that coverage.
However this doesn't clear the flag when the CPU goes down. Therefore
when the CPU goes up again, its boot code is part of the PF_IDLE zone.
Make sure this flag behave consistently and clear the flag when a CPU
exits from the idle loop. If anything, RCU-tasks relies on it to exclude
CPU boot code from its quiescent states.
Fixes: cff9b2332ab7 ("kernel/sched: Modify initial boot task idle setup")
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2 files changed
