[PATCH] sched: add option to serialize load balancing

[linux-2.6] / include / linux / ktime.h

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index ed3396dcc4f753d0d7cdfe8780c679f7315bc65d..611f17f79eefe32f78605589f175db8a77616474 100644 (file)
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -56,7 +56,8 @@ typedef union {
 #endif
 } ktime_t;
 
-#define KTIME_MAX                      (~((u64)1 << 63))
+#define KTIME_MAX                      ((s64)~((u64)1 << 63))
+#define KTIME_SEC_MAX                  (KTIME_MAX / NSEC_PER_SEC)
 
 /*
  * ktime_t definitions when using the 64-bit scalar representation:
@@ -73,6 +74,10 @@ typedef union {
  */
 static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
 {
+#if (BITS_PER_LONG == 64)
+       if (unlikely(secs >= KTIME_SEC_MAX))
+               return (ktime_t){ .tv64 = KTIME_MAX };
+#endif
        return (ktime_t) { .tv64 = (s64)secs * NSEC_PER_SEC + (s64)nsecs };
 }
 
@@ -243,9 +248,9 @@ static inline struct timeval ktime_to_timeval(const ktime_t kt)
  *
  * Returns the scalar nanoseconds representation of kt
  */
-static inline u64 ktime_to_ns(const ktime_t kt)
+static inline s64 ktime_to_ns(const ktime_t kt)
 {
-       return (u64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
+       return (s64) kt.tv.sec * NSEC_PER_SEC + kt.tv.nsec;
 }
 
 #endif