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lockup_detector: Convert per_cpu to __get_cpu_var for readability 

Just a bunch of conversions as suggested by Frederic W.
__get_cpu_var() provides preemption disabled checks.

Plus it gives more readability as it makes it obvious
we are dealing locally now with these vars.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
LKML-Reference: <1274133966-18415-2-git-send-email-dzickus@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Don Zickus 2010-05-17 18:06:04 -04:00 committed by Frederic Weisbecker
parent cafcd80d21
commit 26e09c6eee
1 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
kernel/watchdog.c
View File

@ -115,7 +115,7 @@ static unsigned long get_sample_period(void)
/* Commands for resetting the watchdog */
static void __touch_watchdog(void)
{
int this_cpu = raw_smp_processor_id();
int this_cpu = smp_processor_id();
__get_cpu_var(watchdog_touch_ts) = get_timestamp(this_cpu);
}
@ -157,21 +157,21 @@ void touch_softlockup_watchdog_sync(void)
#ifdef CONFIG_HARDLOCKUP_DETECTOR
/* watchdog detector functions */
static int is_hardlockup(int cpu)
static int is_hardlockup(void)
{
unsigned long hrint = per_cpu(hrtimer_interrupts, cpu);
unsigned long hrint = __get_cpu_var(hrtimer_interrupts);
if (per_cpu(hrtimer_interrupts_saved, cpu) == hrint)
if (__get_cpu_var(hrtimer_interrupts_saved) == hrint)
return 1;
per_cpu(hrtimer_interrupts_saved, cpu) = hrint;
__get_cpu_var(hrtimer_interrupts_saved) = hrint;
return 0;
}
#endif
static int is_softlockup(unsigned long touch_ts, int cpu)
static int is_softlockup(unsigned long touch_ts)
{
unsigned long now = get_timestamp(cpu);
unsigned long now = get_timestamp(smp_processor_id());
/* Warn about unreasonable delays: */
if (time_after(now, touch_ts + softlockup_thresh))
@ -206,8 +206,6 @@ void watchdog_overflow_callback(struct perf_event *event, int nmi,
struct perf_sample_data *data,
struct pt_regs *regs)
{
int this_cpu = smp_processor_id();
if (__get_cpu_var(watchdog_nmi_touch) == true) {
__get_cpu_var(watchdog_nmi_touch) = false;
return;
@ -219,7 +217,9 @@ void watchdog_overflow_callback(struct perf_event *event, int nmi,
* fired multiple times before we overflow'd. If it hasn't
* then this is a good indication the cpu is stuck
*/
if (is_hardlockup(this_cpu)) {
if (is_hardlockup()) {
int this_cpu = smp_processor_id();
/* only print hardlockups once */
if (__get_cpu_var(hard_watchdog_warn) == true)
return;
@ -247,7 +247,6 @@ static inline void watchdog_interrupt_count(void) { return; }
/* watchdog kicker functions */
static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
{
int this_cpu = smp_processor_id();
unsigned long touch_ts = __get_cpu_var(watchdog_touch_ts);
struct pt_regs *regs = get_irq_regs();
int duration;
@ -262,12 +261,12 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
hrtimer_forward_now(hrtimer, ns_to_ktime(get_sample_period()));
if (touch_ts == 0) {
if (unlikely(per_cpu(softlockup_touch_sync, this_cpu))) {
if (unlikely(__get_cpu_var(softlockup_touch_sync))) {
/*
* If the time stamp was touched atomically
* make sure the scheduler tick is up to date.
*/
per_cpu(softlockup_touch_sync, this_cpu) = false;
__get_cpu_var(softlockup_touch_sync) = false;
sched_clock_tick();
}
__touch_watchdog();
@ -280,14 +279,14 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
* indicate it is getting cpu time. If it hasn't then
* this is a good indication some task is hogging the cpu
*/
duration = is_softlockup(touch_ts, this_cpu);
duration = is_softlockup(touch_ts);
if (unlikely(duration)) {
/* only warn once */
if (__get_cpu_var(soft_watchdog_warn) == true)
return HRTIMER_RESTART;
printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
this_cpu, duration,
smp_processor_id(), duration,
current->comm, task_pid_nr(current));
print_modules();
print_irqtrace_events(current);
@ -309,10 +308,10 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
/*
* The watchdog thread - touches the timestamp.
*/
static int watchdog(void *__bind_cpu)
static int watchdog(void *unused)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
struct hrtimer *hrtimer = &per_cpu(watchdog_hrtimer, (unsigned long)__bind_cpu);
struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
sched_setscheduler(current, SCHED_FIFO, &param);
@ -328,7 +327,7 @@ static int watchdog(void *__bind_cpu)
/*
* Run briefly once per second to reset the softlockup timestamp.
* If this gets delayed for more than 60 seconds then the
* debug-printout triggers in softlockup_tick().
* debug-printout triggers in watchdog_timer_fn().
*/
while (!kthread_should_stop()) {
__touch_watchdog();