1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_USER_RETURN_NOTIFIER_H
3 #define _LINUX_USER_RETURN_NOTIFIER_H
4
5 #ifdef CONFIG_USER_RETURN_NOTIFIER
6
7 #include <linux/list.h>
8 #include <linux/sched.h>
9
10 struct user_return_notifier {
11 void (*on_user_return)(struct user_return_notifier *urn);
12 struct hlist_node link;
13 };
14
15
16 void user_return_notifier_register(struct user_return_notifier *urn);
17 void user_return_notifier_unregister(struct user_return_notifier *urn);
18
19 static inline void propagate_user_return_notify(struct task_struct *prev,
20 struct task_struct *next)
21 {
22 if (test_tsk_thread_flag(prev, TIF_USER_RETURN_NOTIFY)) {
23 clear_tsk_thread_flag(prev, TIF_USER_RETURN_NOTIFY);
24 set_tsk_thread_flag(next, TIF_USER_RETURN_NOTIFY);
25 }
26 }
27
28 void fire_user_return_notifiers(void);
29
30 static inline void clear_user_return_notifier(struct task_struct *p)
31 {
32 clear_tsk_thread_flag(p, TIF_USER_RETURN_NOTIFY);
33 }
34
35 #else
36
37 struct user_return_notifier {};
38
39 static inline void propagate_user_return_notify(struct task_struct *prev,
40 struct task_struct *next)
41 {
42 }
43
44 static inline void fire_user_return_notifiers(void) {}
45
46 static inline void clear_user_return_notifier(struct task_struct *p) {}
47
48 #endif
49
50 #endif
51
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