diff options
| author | Ingo Molnar <mingo@elte.hu> | 2011-07-22 17:58:40 +0200 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-24 10:26:14 -0500 |
| commit | 328ee5164ddaac0b9e37010b2e35b193eeb23cfe (patch) | |
| tree | 31c50f5e2aaa5de0695364b0ca60acb8b65de09b /kernel/watchdog.c | |
| parent | d9de053b154ff1c39b3fcaa3cb26b1a877e77976 (diff) | |
printk-kill.patch
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 1d7bca7f4f52..c7e2a2fa6d54 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -201,6 +201,8 @@ static int is_softlockup(unsigned long touch_ts) #ifdef CONFIG_HARDLOCKUP_DETECTOR +static DEFINE_RAW_SPINLOCK(watchdog_output_lock); + static struct perf_event_attr wd_hw_attr = { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES, @@ -235,10 +237,19 @@ static void watchdog_overflow_callback(struct perf_event *event, if (__this_cpu_read(hard_watchdog_warn) == true) return; - if (hardlockup_panic) + /* + * If early-printk is enabled then make sure we do not + * lock up in printk() and kill console logging: + */ + printk_kill(); + + if (hardlockup_panic) { panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu); - else + } else { + raw_spin_lock(&watchdog_output_lock); WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu); + raw_spin_unlock(&watchdog_output_lock); + } __this_cpu_write(hard_watchdog_warn, true); return; |