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Subject[tip:sched/core] watchdog: Reduce message verbosity
Commit-ID:  1b6266ebe3da8198e9a02fbad77bbb56e2f7ce2e
Author: Sinan Kaya <>
AuthorDate: Thu, 2 Aug 2018 23:09:41 -0700
Committer: Thomas Gleixner <>
CommitDate: Fri, 3 Aug 2018 12:19:08 +0200

watchdog: Reduce message verbosity

Code is emitting the following error message during boot on systems
without PMU hardware support while probing NMI capability.

NMI watchdog: Perf event create on CPU 0 failed with -2

This error is emitted as the perf subsystem returns -ENOENT due to lack of
PMUs in the system.

It is followed by the warning that NMI watchdog is disabled:

NMI watchdog: Perf NMI watchdog permanently disabled

While NMI disabled information is useful for ordinary users, seeing a PERF
event create failed with error code -2 is not.

Reduce the message severity to debug so that if debugging is still possible
in case the error code returned by perf is required for analysis.

Signed-off-by: Sinan Kaya <>
Signed-off-by: Thomas Gleixner <>
Acked-by: Don Zickus <>
Cc: Kate Stewart <>
Cc: Greg Kroah-Hartman <>
Cc: Colin Ian King <>
Cc: Peter Zijlstra <>

kernel/watchdog_hld.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index e449a23e9d59..1f7020d65d0a 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -175,8 +175,8 @@ static int hardlockup_detector_event_create(void)
evt = perf_event_create_kernel_counter(wd_attr, cpu, NULL,
watchdog_overflow_callback, NULL);
if (IS_ERR(evt)) {
- pr_info("Perf event create on CPU %d failed with %ld\n", cpu,
- PTR_ERR(evt));
+ pr_debug("Perf event create on CPU %d failed with %ld\n", cpu,
+ PTR_ERR(evt));
return PTR_ERR(evt);
this_cpu_write(watchdog_ev, evt);
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