[PATCH 1/2] watchdog: Fix output

From: Peter Zijlstra
Date: Fri Mar 18 2016 - 11:32:12 EST


The pr_crap() functions generate idiotic output; use printk().

Broken output:

[ 3538.718135] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [perf_fuzzer:2646]
[ 3383.233583] NMI watchdog: Watchdog detected hard LOCKUP on cpu 27

Fixed output:

[14180.328194] BUG: soft lockup - CPU#2 stuck for 23s! [perf_fuzzer:13650]
[ 1064.914925] BUG: NMI Watchdog detected hard LOCKUP on cpu 11

Cc: Don Zickus <dzickus@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
kernel/watchdog.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -350,7 +350,7 @@ static void watchdog_overflow_callback(s
if (__this_cpu_read(hard_watchdog_warn) == true)
return;

- pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+ printk(KERN_EMERG "BUG: NMI detected hard LOCKUP on cpu %d", this_cpu);
print_modules();
print_irqtrace_events(current);
if (regs)
@@ -467,7 +467,7 @@ static enum hrtimer_restart watchdog_tim
}
}

- pr_emerg("BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
+ printk(KERN_EMERG "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
smp_processor_id(), duration,
current->comm, task_pid_nr(current));
__this_cpu_write(softlockup_task_ptr_saved, current);