[PATCH] Time: Introduce arch generic time accessors

Introduces clocksource switching code and the arch generic time accessor
functions that use the clocksource infrastructure.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/time.h b/include/linux/time.h
index 88d3b812841e..65dd85b2105e 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -102,6 +102,7 @@ extern int do_getitimer(int which, struct itimerval *value);
 extern void getnstimeofday(struct timespec *tv);
 
 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
+extern int timekeeping_is_continuous(void);
 
 /**
  * timespec_to_ns - Convert timespec to nanoseconds
@@ -144,6 +145,20 @@ extern struct timespec ns_to_timespec(const s64 nsec);
  */
 extern struct timeval ns_to_timeval(const s64 nsec);
 
+/**
+ * timespec_add_ns - Adds nanoseconds to a timespec
+ * @a:          pointer to timespec to be incremented
+ * @ns:         unsigned nanoseconds value to be added
+ */
+static inline void timespec_add_ns(struct timespec *a, u64 ns)
+{
+        ns += a->tv_nsec;
+        while(unlikely(ns >= NSEC_PER_SEC)) {
+                ns -= NSEC_PER_SEC;
+                a->tv_sec++;
+        }
+        a->tv_nsec = ns;
+}
 #endif /* __KERNEL__ */
 
 #define NFDBITS                 __NFDBITS