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sched,freezer: Mark TASK_FROZEN special

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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: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Tested-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/20240727105029.998329901@infradead.org
This commit is contained in:
Peter Zijlstra 2024-07-01 21:30:09 +02:00
parent 781773e3b6
commit a1c446611e
2 changed files with 4 additions and 3 deletions
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5
include/linux/sched.h
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@ -149,8 +149,9 @@ struct user_event_mm;
* Special states are those that do not use the normal wait-loop pattern. See
* the comment with set_special_state().
*/
#define is_special_task_state(state) \
((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))
#define is_special_task_state(state) \
((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | \
TASK_DEAD | TASK_FROZEN))
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
# define debug_normal_state_change(state_value) \

2
kernel/freezer.c
View File

@ -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);