path: root/include/linux
diff options
authorFrederic Weisbecker <fweisbec@gmail.com>2013-02-24 00:23:25 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2013-03-07 17:09:25 +0100
commit56dd9470d7c8734f055da2a6bac553caf4a468eb (patch)
tree5a7dc1ee23be1e15171c301516d20db90eee9435 /include/linux
parent6dbe51c251a327e012439c4772097a13df43c5b8 (diff)
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')
1 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index b28d161c109..5a69273e93e 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -1,10 +1,11 @@
#include <linux/sched.h>
#include <linux/percpu.h>
+#include <asm/ptrace.h>
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);
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) { }