Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     tglx@linutronix.de
Cc:     linux-kernel@vger.kernel.org, john.stultz@linaro.org,
        sboyd@kernel.org, corbet@lwn.net, Mark.Rutland@arm.com,
        maz@kernel.org, kernel-team@meta.com, neeraju@codeaurora.org,
        ak@linux.intel.com, feng.tang@intel.com, zhengjun.xing@intel.com,
        daniel.lezcano@linaro.org, "Paul E. McKenney" <paulmck@kernel.org>,
        Chris Bainbridge <chris.bainbridge@gmail.com>
Subject: [PATCH clocksource 1/2] clocksource: Handle negative skews in "skew is too large" messages
Date:   Mon, 17 Jul 2023 11:28:13 -0700
Message-Id: <20230717182814.1099419-1-paulmck@kernel.org>
In-Reply-To: <db4a845e-5f87-4aee-8957-150c253f67e7@paulmck-laptop>
References: <db4a845e-5f87-4aee-8957-150c253f67e7@paulmck-laptop>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The nanosecond-to-millisecond skew computation uses unsigned arithmetic,
which produces user-unfriendly large positive numbers for negative skews.
Therefore, use signed arithmetic for this computation in order to preserve
the negativity.

Reported-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Reported-by: Feng Tang <feng.tang@intel.com>
Fixes: dd029269947a ("clocksource: Improve "skew is too large" messages")
Reviewed-by: Feng Tang <feng.tang@intel.com>
Tested-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 kernel/time/clocksource.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 88cbc1181b23..c108ed8a9804 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -473,8 +473,8 @@ static void clocksource_watchdog(struct timer_list *unused)
 		/* Check the deviation from the watchdog clocksource. */
 		md = cs->uncertainty_margin + watchdog->uncertainty_margin;
 		if (abs(cs_nsec - wd_nsec) > md) {
-			u64 cs_wd_msec;
-			u64 wd_msec;
+			s64 cs_wd_msec;
+			s64 wd_msec;
 			u32 wd_rem;
 
 			pr_warn("timekeeping watchdog on CPU%d: Marking clocksource '%s' as unstable because the skew is too large:\n",
@@ -483,8 +483,8 @@ static void clocksource_watchdog(struct timer_list *unused)
 				watchdog->name, wd_nsec, wdnow, wdlast, watchdog->mask);
 			pr_warn("                      '%s' cs_nsec: %lld cs_now: %llx cs_last: %llx mask: %llx\n",
 				cs->name, cs_nsec, csnow, cslast, cs->mask);
-			cs_wd_msec = div_u64_rem(cs_nsec - wd_nsec, 1000U * 1000U, &wd_rem);
-			wd_msec = div_u64_rem(wd_nsec, 1000U * 1000U, &wd_rem);
+			cs_wd_msec = div_s64_rem(cs_nsec - wd_nsec, 1000 * 1000, &wd_rem);
+			wd_msec = div_s64_rem(wd_nsec, 1000 * 1000, &wd_rem);
 			pr_warn("                      Clocksource '%s' skewed %lld ns (%lld ms) over watchdog '%s' interval of %lld ns (%lld ms)\n",
 				cs->name, cs_nsec - wd_nsec, cs_wd_msec, watchdog->name, wd_nsec, wd_msec);
 			if (curr_clocksource == cs)
-- 
2.40.1