linux-kernel - [PATCH] clocksource: Print clocksource name when clocksource is tested unstable

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Date:   Wed, 16 Nov 2022 16:22:21 +0800
From:   Yunying Sun <yunying.sun@...el.com>
To:     tglx@...utronix.de, peterz@...radead.org, paulmck@...nel.org,
        longman@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     feng.tang@...el.com, yunying.sun@...el.com
Subject: [PATCH] clocksource: Print clocksource name when clocksource is tested unstable

Some "TSC fall back to HPET" cases are seen on systems that have more
than 2 numa nodes. When this happens, in kernel log it has:

clocksource: timekeeping watchdog on CPU168: hpet read-back delay of 4296200ns, attempt 4, marking unstable

The "hpet" here is misleading since it prints only the name of watchdog,
where actually it's measuring the delay of 3 reads: wd-clocksource-wd.

Signed-off-by: Yunying Sun <yunying.sun@...el.com>
---
 kernel/time/clocksource.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 8058bec87ace..fac8c0d90e61 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -257,8 +257,8 @@ static enum wd_read_status cs_watchdog_read(struct clocksource *cs, u64 *csnow,
 			goto skip_test;
 	}
 
-	pr_warn("timekeeping watchdog on CPU%d: %s read-back delay of %lldns, attempt %d, marking unstable\n",
-		smp_processor_id(), watchdog->name, wd_delay, nretries);
+	pr_warn("timekeeping watchdog on CPU%d: wd-%s-wd read-back delay of %lldns, attempt %d, marking unstable\n",
+		smp_processor_id(), cs->name, wd_delay, nretries);
 	return WD_READ_UNSTABLE;
 
 skip_test:
-- 
2.17.0