[PATCH] freezer,sched: Report TASK_FROZEN tasks as TASK_UNINTERRUPTIBLE

[Liangliang Li]

TASK_FROZEN is not in TASK_REPORT, thus a frozen task will appear as
state == 0, IOW TASK_RUNNING.

Fix this by make TASK_FROZEN appear as TASK_UNINTERRUPTIBLE, thus we
dont need to imply a new state to userspace tools.

Signed-off-by: Liangliang Li <liliangliang@xxxxxxxx>
---
 include/linux/sched.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 292c31697248..0cfe2ba4fc6f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1690,6 +1690,10 @@ static inline unsigned int __task_state_index(unsigned int tsk_state,
 	if (tsk_state & TASK_RTLOCK_WAIT)
 		state = TASK_UNINTERRUPTIBLE;
 
+	/* Frozen tasks should appear as "D (disk sleep)' in userspace. */
+	if (tsk_state & TASK_FROZEN)
+		state = TASK_UNINTERRUPTIBLE;
+
 	return fls(state);
 }
 
-- 
2.34.1