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hc
2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/kernel/kthread.c
....@@ -264,7 +264,6 @@
264264 
265265 static int kthread(void *_create)
266266 {
267
-	static const struct sched_param param = { .sched_priority = 0 };
268267 	/* Copy data: it's on kthread's stack */
269268 	struct kthread_create_info *create = _create;
270269 	int (*threadfn)(void *data) = create->threadfn;
....@@ -294,13 +293,6 @@
294293 	init_completion(&self->exited);
295294 	init_completion(&self->parked);
296295 	current->vfork_done = &self->exited;
297
-
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-	/*
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-	 * The new thread inherited kthreadd's priority and CPU mask. Reset
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-	 * back to default in case they have been changed.
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-	 */
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-	sched_setscheduler_nocheck(current, SCHED_NORMAL, &param);
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-	set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_KTHREAD));
304296 
305297 	/* OK, tell user we're spawned, wait for stop or wakeup */
306298 	__set_current_state(TASK_UNINTERRUPTIBLE);
....@@ -399,6 +391,7 @@
399391 	}
400392 	task = create->result;
401393 	if (!IS_ERR(task)) {
394
+		static const struct sched_param param = { .sched_priority = 0 };
402395 		char name[TASK_COMM_LEN];
403396 
404397 		/*
....@@ -407,6 +400,13 @@
407400 		 */
408401 		vsnprintf(name, sizeof(name), namefmt, args);
409402 		set_task_comm(task, name);
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+		/*
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+		 * root may have changed our (kthreadd's) priority or CPU mask.
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+		 * The kernel thread should not inherit these properties.
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+		 */
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+		sched_setscheduler_nocheck(task, SCHED_NORMAL, &param);
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+		set_cpus_allowed_ptr(task,
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+				     housekeeping_cpumask(HK_FLAG_KTHREAD));
410410 	}
411411 	kfree(create);
412412 	return task;