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authorJohn Stultz <john.stultz@linaro.org>2015-09-14 18:05:20 -0700
committerThomas Gleixner <tglx@linutronix.de>2015-10-02 22:53:01 +0200
commit67dfae0cd72fec5cd158b6e5fb1647b7dbe0834c (patch)
tree6b4740d09261098ec7731412b8537418df5ec255
parentbdf7344e14d826d0df438a55fc51146d179e198d (diff)
downloadlinux-67dfae0cd72fec5cd158b6e5fb1647b7dbe0834c.tar.bz2
clocksource: Fix abs() usage w/ 64bit values
This patch fixes one cases where abs() was being used with 64-bit nanosecond values, where the result may be capped at 32-bits. This potentially could cause watchdog false negatives on 32-bit systems, so this patch addresses the issue by using abs64(). Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1442279124-7309-2-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/time/clocksource.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 841b72f720e8..3a38775b50c2 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -217,7 +217,7 @@ static void clocksource_watchdog(unsigned long data)
continue;
/* Check the deviation from the watchdog clocksource. */
- if ((abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD)) {
+ if (abs64(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
pr_warn("timekeeping watchdog: Marking clocksource '%s' as unstable because the skew is too large:\n",
cs->name);
pr_warn(" '%s' wd_now: %llx wd_last: %llx mask: %llx\n",