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authorFrederic Weisbecker <fweisbec@gmail.com>2013-07-11 21:12:32 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2013-08-14 19:12:46 +0400
commit65f382fd0c8fa483713c0971de9f1dfb4cf1ad9c (patch)
treedec89c43fcfb4934611bae4855293428382856b9 /include/linux/context_tracking.h
parentd84d27a491880b9902b45c09be8d9e9464fb9b74 (diff)
downloadlinux-65f382fd0c8fa483713c0971de9f1dfb4cf1ad9c.tar.xz
context_tracking: Ground setup for static key use
Prepare for using a static key in the context tracking subsystem. This will help optimizing the off case on its many users: * user_enter, user_exit, exception_enter, exception_exit, guest_enter, guest_exit, vtime_*() Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'include/linux/context_tracking.h')
-rw-r--r--include/linux/context_tracking.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 1ae37c708c63..c138c24bad1a 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -4,6 +4,7 @@
#include <linux/sched.h>
#include <linux/percpu.h>
#include <linux/vtime.h>
+#include <linux/static_key.h>
#include <asm/ptrace.h>
struct context_tracking {
@@ -22,6 +23,7 @@ struct context_tracking {
#ifdef CONFIG_CONTEXT_TRACKING
+extern struct static_key context_tracking_enabled;
DECLARE_PER_CPU(struct context_tracking, context_tracking);
static inline bool context_tracking_in_user(void)
@@ -67,6 +69,14 @@ static inline void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */
+
+#ifdef CONFIG_CONTEXT_TRACKING_FORCE
+extern void context_tracking_init(void);
+#else
+static inline void context_tracking_init(void) { }
+#endif /* CONFIG_CONTEXT_TRACKING_FORCE */
+
+
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
extern void guest_enter(void);
extern void guest_exit(void);