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| author | Grant Likely <grant.likely@secretlab.ca> | 2012-07-11 16:08:35 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-07-11 16:08:35 +0100 |
| commit | 80c1834fc86c2bbacb54a8fc3c04a8b0066b0996 (patch) | |
| tree | 8200248706960af8b779e9144f5b51c670602228 /kernel/watchdog.c | |
| parent | 22076c7712be29a602de45b1c573f31adbd428a9 (diff) | |
| parent | bd0a521e88aa7a06ae7aabaed7ae196ed4ad867a (diff) | |
| download | linux-stable-80c1834fc86c2bbacb54a8fc3c04a8b0066b0996.tar.gz linux-stable-80c1834fc86c2bbacb54a8fc3c04a8b0066b0996.tar.bz2 linux-stable-80c1834fc86c2bbacb54a8fc3c04a8b0066b0996.zip | |
Merge tag 'v3.5-rc6' into irqdomain/next
Linux 3.5-rc6
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index e5e1d85b8c7c..4b1dfba70f7c 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -372,6 +372,13 @@ static int watchdog(void *unused) #ifdef CONFIG_HARDLOCKUP_DETECTOR +/* + * People like the simple clean cpu node info on boot. + * Reduce the watchdog noise by only printing messages + * that are different from what cpu0 displayed. + */ +static unsigned long cpu0_err; + static int watchdog_nmi_enable(int cpu) { struct perf_event_attr *wd_attr; @@ -390,11 +397,21 @@ static int watchdog_nmi_enable(int cpu) /* Try to register using hardware perf events */ event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL); + + /* save cpu0 error for future comparision */ + if (cpu == 0 && IS_ERR(event)) + cpu0_err = PTR_ERR(event); + if (!IS_ERR(event)) { - pr_info("enabled, takes one hw-pmu counter.\n"); + /* only print for cpu0 or different than cpu0 */ + if (cpu == 0 || cpu0_err) + pr_info("enabled on all CPUs, permanently consumes one hw-PMU counter.\n"); goto out_save; } + /* skip displaying the same error again */ + if (cpu > 0 && (PTR_ERR(event) == cpu0_err)) + return PTR_ERR(event); /* vary the KERN level based on the returned errno */ if (PTR_ERR(event) == -EOPNOTSUPP) |