diff options
Diffstat (limited to 'include/linux/context_tracking.h')
-rw-r--r-- | include/linux/context_tracking.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h index b28d161c1091..365f4a61bf04 100644 --- a/include/linux/context_tracking.h +++ b/include/linux/context_tracking.h | |||
@@ -1,9 +1,9 @@ | |||
1 | #ifndef _LINUX_CONTEXT_TRACKING_H | 1 | #ifndef _LINUX_CONTEXT_TRACKING_H |
2 | #define _LINUX_CONTEXT_TRACKING_H | 2 | #define _LINUX_CONTEXT_TRACKING_H |
3 | 3 | ||
4 | #ifdef CONFIG_CONTEXT_TRACKING | ||
5 | #include <linux/sched.h> | 4 | #include <linux/sched.h> |
6 | #include <linux/percpu.h> | 5 | #include <linux/percpu.h> |
6 | #include <asm/ptrace.h> | ||
7 | 7 | ||
8 | struct context_tracking { | 8 | struct context_tracking { |
9 | /* | 9 | /* |
@@ -13,12 +13,13 @@ struct context_tracking { | |||
13 | * may be further optimized using static keys. | 13 | * may be further optimized using static keys. |
14 | */ | 14 | */ |
15 | bool active; | 15 | bool active; |
16 | enum { | 16 | enum ctx_state { |
17 | IN_KERNEL = 0, | 17 | IN_KERNEL = 0, |
18 | IN_USER, | 18 | IN_USER, |
19 | } state; | 19 | } state; |
20 | }; | 20 | }; |
21 | 21 | ||
22 | #ifdef CONFIG_CONTEXT_TRACKING | ||
22 | DECLARE_PER_CPU(struct context_tracking, context_tracking); | 23 | DECLARE_PER_CPU(struct context_tracking, context_tracking); |
23 | 24 | ||
24 | static inline bool context_tracking_in_user(void) | 25 | static inline bool context_tracking_in_user(void) |
@@ -33,12 +34,31 @@ static inline bool context_tracking_active(void) | |||
33 | 34 | ||
34 | extern void user_enter(void); | 35 | extern void user_enter(void); |
35 | extern void user_exit(void); | 36 | extern void user_exit(void); |
37 | |||
38 | static inline enum ctx_state exception_enter(void) | ||
39 | { | ||
40 | enum ctx_state prev_ctx; | ||
41 | |||
42 | prev_ctx = this_cpu_read(context_tracking.state); | ||
43 | user_exit(); | ||
44 | |||
45 | return prev_ctx; | ||
46 | } | ||
47 | |||
48 | static inline void exception_exit(enum ctx_state prev_ctx) | ||
49 | { | ||
50 | if (prev_ctx == IN_USER) | ||
51 | user_enter(); | ||
52 | } | ||
53 | |||
36 | extern void context_tracking_task_switch(struct task_struct *prev, | 54 | extern void context_tracking_task_switch(struct task_struct *prev, |
37 | struct task_struct *next); | 55 | struct task_struct *next); |
38 | #else | 56 | #else |
39 | static inline bool context_tracking_in_user(void) { return false; } | 57 | static inline bool context_tracking_in_user(void) { return false; } |
40 | static inline void user_enter(void) { } | 58 | static inline void user_enter(void) { } |
41 | static inline void user_exit(void) { } | 59 | static inline void user_exit(void) { } |
60 | static inline enum ctx_state exception_enter(void) { return 0; } | ||
61 | static inline void exception_exit(enum ctx_state prev_ctx) { } | ||
42 | static inline void context_tracking_task_switch(struct task_struct *prev, | 62 | static inline void context_tracking_task_switch(struct task_struct *prev, |
43 | struct task_struct *next) { } | 63 | struct task_struct *next) { } |
44 | #endif /* !CONFIG_CONTEXT_TRACKING */ | 64 | #endif /* !CONFIG_CONTEXT_TRACKING */ |