linux-kernel - [PATCH] kthread: set kthread state to TASK

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Message-ID: <DM6PR11MB3531D3B164357B2DC476102DDFC90@DM6PR11MB3531.namprd11.prod.outlook.com>
Date:   Wed,  1 Apr 2020 14:52:15 +0800
From:   liyueyi <liyueyi@...e.com>
To:     peterz@...radead.org, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, liyueyi <liyueyi@...omi.com>
Subject: [PATCH] kthread: set kthread state to TASK_IDLE.

From: liyueyi <liyueyi@...omi.com>

Currently kthread() sleeps in TASK_UNINTERRUPTIBLE state waiting
for the first wakeup, it may be detected by DETECT_HUNG_TASK if
the first wakeup is coming later. Since kernel has introduced
TASK_IDLE, change kthread state to TASK_IDLE.

Signed-off-by: liyueyi <liyueyi@...omi.com>
---
 kernel/kthread.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/kthread.c b/kernel/kthread.c
index b262f470..f841419 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -243,7 +243,7 @@ static int kthread(void *_create)
 	current->vfork_done = &self->exited;

 	/* OK, tell user we're spawned, wait for stop or wakeup */
-	__set_current_state(TASK_UNINTERRUPTIBLE);
+	__set_current_state(TASK_IDLE);
 	create->result = current;
 	complete(done);
 	schedule();
@@ -415,7 +415,7 @@ static void __kthread_bind(struct task_struct *p, unsigned int cpu, long state)

 void kthread_bind_mask(struct task_struct *p, const struct cpumask *mask)
 {
-	__kthread_bind_mask(p, mask, TASK_UNINTERRUPTIBLE);
+	__kthread_bind_mask(p, mask, TASK_IDLE);
 }

 /**
@@ -429,7 +429,7 @@ void kthread_bind_mask(struct task_struct *p, const struct cpumask *mask)
  */
 void kthread_bind(struct task_struct *p, unsigned int cpu)
 {
-	__kthread_bind(p, cpu, TASK_UNINTERRUPTIBLE);
+	__kthread_bind(p, cpu, TASK_IDLE);
 }
 EXPORT_SYMBOL(kthread_bind);

-- 
2.7.4