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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-02-24 03:23:25 +0400 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-03-07 20:09:25 +0400 |
| commit | 56dd9470d7c8734f055da2a6bac553caf4a468eb (patch) | |
| tree | 5a7dc1ee23be1e15171c301516d20db90eee9435 /include/linux | |
| parent | 6dbe51c251a327e012439c4772097a13df43c5b8 (diff) | |
| download | linux-56dd9470d7c8734f055da2a6bac553caf4a468eb.tar.xz | |
context_tracking: Move exception handling to generic code
Exceptions handling on context tracking should share common
treatment: on entry we exit user mode if the exception triggered
in that context. Then on exception exit we return to that previous
context.
Generalize this to avoid duplication across archs.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Mats Liljegren <mats.liljegren@enea.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/context_tracking.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h index b28d161c1091..5a69273e93e6 100644 --- a/include/linux/context_tracking.h +++ b/include/linux/context_tracking.h @@ -1,10 +1,11 @@ #ifndef _LINUX_CONTEXT_TRACKING_H #define _LINUX_CONTEXT_TRACKING_H -#ifdef CONFIG_CONTEXT_TRACKING #include <linux/sched.h> #include <linux/percpu.h> +#include <asm/ptrace.h> +#ifdef CONFIG_CONTEXT_TRACKING struct context_tracking { /* * When active is false, probes are unset in order @@ -33,12 +34,26 @@ static inline bool context_tracking_active(void) extern void user_enter(void); extern void user_exit(void); + +static inline void exception_enter(struct pt_regs *regs) +{ + user_exit(); +} + +static inline void exception_exit(struct pt_regs *regs) +{ + if (user_mode(regs)) + user_enter(); +} + extern void context_tracking_task_switch(struct task_struct *prev, struct task_struct *next); #else static inline bool context_tracking_in_user(void) { return false; } static inline void user_enter(void) { } static inline void user_exit(void) { } +static inline void exception_enter(struct pt_regs *regs) { } +static inline void exception_exit(struct pt_regs *regs) { } static inline void context_tracking_task_switch(struct task_struct *prev, struct task_struct *next) { } #endif /* !CONFIG_CONTEXT_TRACKING */ |