h63xx: nfs mount works, gpe image boots to ts config screen.

[linux-2.6-omap-h63xx.git] / kernel / time.c

diff --git a/kernel/time.c b/kernel/time.c
index 6a08660b4fac30f97ea573b9cd017941401046ff..d63a4336fad69c85f007788a7932959595f0cb73 100644 (file)
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -669,3 +669,21 @@ EXPORT_SYMBOL(get_jiffies_64);
 #endif
 
 EXPORT_SYMBOL(jiffies);
+
+/*
+ * Add two timespec values and do a safety check for overflow.
+ * It's assumed that both values are valid (>= 0)
+ */
+struct timespec timespec_add_safe(const struct timespec lhs,
+                                 const struct timespec rhs)
+{
+       struct timespec res;
+
+       set_normalized_timespec(&res, lhs.tv_sec + rhs.tv_sec,
+                               lhs.tv_nsec + rhs.tv_nsec);
+
+       if (res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)
+               res.tv_sec = TIME_T_MAX;
+
+       return res;
+}