Merge tag 'rproc-fixes-for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git...

[~andy/linux] / kernel / watchdog.c

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index e5e1d85b8c7c23090ce59b7e5b1e868535c85ef0..4b1dfba70f7cf8ae7397623656a9b695028f702a 100644 (file)
--- 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)