s390/time: cast tv_nsec to u64 prior to shift in update_vsyscall

Analog to git commit 28b92e09e25bdc0ae864b22eacf195a74f861389
first cast tk->wall_to_monotonic.tv_nsec to u64 before doing
the shift with tk->shift to avoid loosing relevant bits on a
32-bit kernel.

Cc: stable@vger.kernel.org # 3.13+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 386d37a228bb71d7717f46c76d3fc4b7a05ab015..0931b110c8260d30774d1ed3c89acb3e300a44b6 100644 (file)
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -226,7 +226,7 @@ void update_vsyscall(struct timekeeper *tk)
        vdso_data->wtom_clock_sec =
                tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
        vdso_data->wtom_clock_nsec = tk->xtime_nsec +
-               + (tk->wall_to_monotonic.tv_nsec << tk->shift);
+               + ((u64) tk->wall_to_monotonic.tv_nsec << tk->shift);
        nsecps = (u64) NSEC_PER_SEC << tk->shift;
        while (vdso_data->wtom_clock_nsec >= nsecps) {
                vdso_data->wtom_clock_nsec -= nsecps;