Commit a1c44661 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

sched,freezer: Mark TASK_FROZEN special 



The special task states are those that do not suffer spurious wakeups,
TASK_FROZEN is very much one of those, mark it as such.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarValentin Schneider <vschneid@redhat.com>
Tested-by: default avatarValentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/20240727105029.998329901@infradead.org
parent 781773e3

include/linux/sched.h

+3 −2
Original line number Diff line number Diff line
@@ -150,7 +150,8 @@ struct user_event_mm; 
 * the comment with set_special_state().

 */

#define is_special_task_state(state)					\

	((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))

	((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED |	\

		    TASK_DEAD | TASK_FROZEN))



#ifdef CONFIG_DEBUG_ATOMIC_SLEEP

# define debug_normal_state_change(state_value)				\

kernel/freezer.c

+1 −1
Original line number Diff line number Diff line
@@ -72,7 +72,7 @@ bool __refrigerator(bool check_kthr_stop) 
		bool freeze;



		raw_spin_lock_irq(&current->pi_lock);

		set_current_state(TASK_FROZEN);

		WRITE_ONCE(current->__state, TASK_FROZEN);

		/* unstale saved_state so that __thaw_task() will wake us up */

		current->saved_state = TASK_RUNNING;

		raw_spin_unlock_irq(&current->pi_lock);