The following commit has been merged into the timers/urgent branch of tip:
Commit-ID: e3fab2f3de081e98c50b7b4ace1b040161d95310
Gitweb: https://git.kernel.org/tip/e3fab2f3de081e98c50b7b4ace1b040161d95310
Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
AuthorDate: Mon, 11 Jan 2021 11:39:56 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 12 Jan 2021 21:13:01 +01:00
ntp: Fix RTC synchronization on 32-bit platforms
Due to an integer overflow, RTC synchronization now happens every 2s
instead of the intended 11 minutes. Fix this by forcing 64-bit
arithmetic for the sync period calculation.
Annotate the other place which multiplies seconds for consistency as well.
Fixes: c9e6189fb03123a7 ("ntp: Make the RTC synchronization more reliable")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210111103956.290378-1-geert+renesas@xxxxxxxxx
---
kernel/time/ntp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 7404d38..87389b9 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -498,7 +498,7 @@ out:
static void sync_hw_clock(struct work_struct *work);
static DECLARE_WORK(sync_work, sync_hw_clock);
static struct hrtimer sync_hrtimer;
-#define SYNC_PERIOD_NS (11UL * 60 * NSEC_PER_SEC)
+#define SYNC_PERIOD_NS (11ULL * 60 * NSEC_PER_SEC)
static enum hrtimer_restart sync_timer_callback(struct hrtimer *timer)
{
@@ -512,7 +512,7 @@ static void sched_sync_hw_clock(unsigned long offset_nsec, bool retry)
ktime_t exp = ktime_set(ktime_get_real_seconds(), 0);
if (retry)
- exp = ktime_add_ns(exp, 2 * NSEC_PER_SEC - offset_nsec);
+ exp = ktime_add_ns(exp, 2ULL * NSEC_PER_SEC - offset_nsec);
else
exp = ktime_add_ns(exp, SYNC_PERIOD_NS - offset_nsec);
|