[PATCH] blktrace: add timestamp message

[safe/jmp/linux-2.6] / include / linux / time.h

diff --git a/include/linux/time.h b/include/linux/time.h
index 2fa2987..a5b7399 100644 (file)
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -71,6 +71,18 @@ extern unsigned long mktime(const unsigned int year, const unsigned int mon,
 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
 
 /*
+ * sub = lhs - rhs, in normalized form
+ */
+static inline struct timespec timespec_sub(struct timespec lhs,
+                                               struct timespec rhs)
+{
+       struct timespec ts_delta;
+       set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
+                               lhs.tv_nsec - rhs.tv_nsec);
+       return ts_delta;
+}
+
+/*
  * Returns true if the timespec is norm, false if denorm:
  */
 #define timespec_valid(ts) \
@@ -80,6 +92,8 @@ extern struct timespec xtime;
 extern struct timespec wall_to_monotonic;
 extern seqlock_t xtime_lock;
 
+void timekeeping_init(void);
+
 static inline unsigned long get_seconds(void)
 {
        return xtime.tv_sec;
@@ -103,6 +117,7 @@ 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
@@ -145,6 +160,20 @@ 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