time: Prevent 32 bit overflow with set_normalized_timespec()

[pandora-kernel.git] / kernel / time.c

diff --git a/kernel/time.c b/kernel/time.c
index 2951194..2e2e469 100644 (file)
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -370,13 +370,20 @@ EXPORT_SYMBOL(mktime);
  *     0 <= tv_nsec < NSEC_PER_SEC
  * For negative values only the tv_sec field is negative !
  */
-void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec)
+void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec)
 {
        while (nsec >= NSEC_PER_SEC) {
+               /*
+                * The following asm() prevents the compiler from
+                * optimising this loop into a modulo operation. See
+                * also __iter_div_u64_rem() in include/linux/time.h
+                */
+               asm("" : "+rm"(nsec));
                nsec -= NSEC_PER_SEC;
                ++sec;
        }
        while (nsec < 0) {
+               asm("" : "+rm"(nsec));
                nsec += NSEC_PER_SEC;
                --sec;
        }