[PATCH] hrtimer: create and use timespec_valid macro

add timespec_valid(ts) [returns false if the timespec is denorm]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 8 insertions, 3 deletions

diff --git a/include/linux/time.h b/include/linux/time.h
index 4d49cabb9b47..64e797464589 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -44,6 +44,12 @@ 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);
 
+/*
+ * Returns true if the timespec is norm, false if denorm:
+ */
+#define timespec_valid(ts) \
+        (((ts)->tv_sec >= 0) && (((unsigned) (ts)->tv_nsec) < NSEC_PER_SEC))
+
 extern struct timespec xtime;
 extern struct timespec wall_to_monotonic;
 extern seqlock_t xtime_lock;
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 69d5a4b5395b..6b851a1bf4b0 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -712,8 +712,7 @@ out:
  */
 static int good_timespec(const struct timespec *ts)
 {
-        if ((!ts) || (ts->tv_sec < 0) ||
-                        ((unsigned) ts->tv_nsec >= NSEC_PER_SEC))
+        if ((!ts) || !timespec_valid(ts))
                 return 0;
         return 1;
 }
@@ -1406,7 +1405,7 @@ sys_clock_nanosleep(const clockid_t which_clock, int flags,
         if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
                 return -EFAULT;
 
-        if ((unsigned) t.tv_nsec >= NSEC_PER_SEC || t.tv_sec < 0)
+        if (!timespec_valid(&t))
                 return -EINVAL;
 
         /*