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generated by cgit v1.2.2 (git 2.25.0) at 2025-05-16 11:33:46 -0400
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#include <linux/spinlock.h>
#include <linux/task_work.h>
#include <linux/tracehook.h>

static struct callback_head work_exited; /* all we need is ->next == NULL */

int
task_work_add(struct task_struct *task, struct callback_head *work, bool notify)
{
	struct callback_head *head;

	do {
		head = ACCESS_ONCE(task->task_works);
		if (unlikely(head == &work_exited))
			return -ESRCH;
		work->next = head;
	} while (cmpxchg(&task->task_works, head, work) != head);

	if (notify)
		set_notify_resume(task);
	return 0;
}

struct callback_head *
task_work_cancel(struct task_struct *task, task_work_func_t func)
{
	struct callback_head **pprev = &task->task_works;
	struct callback_head *work = NULL;
	unsigned long flags;
	/*
	 * If cmpxchg() fails we continue without updating pprev.