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From: tip-bot for Don Zickus on 13 May 2010 03:00
Commit-ID: 332fbdbca3f7716c5620970755ae054d213bcc4e
Gitweb: http://git.kernel.org/tip/332fbdbca3f7716c5620970755ae054d213bcc4e
Author: Don Zickus <dzickus(a)redhat.com>
AuthorDate: Fri, 7 May 2010 17:11:45 -0400
Committer: Frederic Weisbecker <fweisbec(a)gmail.com>
CommitDate: Wed, 12 May 2010 23:55:43 +0200

lockup_detector: Touch_softlockup cleanups and softlockup_tick removal

Just some code cleanup to make touch_softlockup clearer and remove the
softlockup_tick function as it is no longer needed.

Also remove the /proc softlockup_thres call as it has been changed to
watchdog_thres.

Signed-off-by: Don Zickus <dzickus(a)redhat.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
Cc: Peter Zijlstra <peterz(a)infradead.org>
Cc: Cyrill Gorcunov <gorcunov(a)gmail.com>
Cc: Eric Paris <eparis(a)redhat.com>
Cc: Randy Dunlap <randy.dunlap(a)oracle.com>
LKML-Reference: <1273266711-18706-3-git-send-email-dzickus(a)redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec(a)gmail.com>
---
include/linux/sched.h | 16 +++-------------
kernel/sysctl.c | 9 ---------
kernel/timer.c | 1 -
kernel/watchdog.c | 35 +++--------------------------------
4 files changed, 6 insertions(+), 55 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 37efe8f..33f9b2a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -312,19 +312,15 @@ extern void scheduler_tick(void);
extern void sched_show_task(struct task_struct *p);

#ifdef CONFIG_DETECT_SOFTLOCKUP
-extern void softlockup_tick(void);
extern void touch_softlockup_watchdog(void);
extern void touch_softlockup_watchdog_sync(void);
extern void touch_all_softlockup_watchdogs(void);
-extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos);
+extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos);
extern unsigned int softlockup_panic;
extern int softlockup_thresh;
#else
-static inline void softlockup_tick(void)
-{
-}
static inline void touch_softlockup_watchdog(void)
{
}
@@ -346,12 +342,6 @@ extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
size_t *lenp, loff_t *ppos);
#endif

-#ifdef CONFIG_LOCKUP_DETECTOR
-extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos);
-#endif
-
/* Attach to any functions which should be ignored in wchan output. */
#define __sched __attribute__((__section__(".sched.text")))

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0f9adda..999bc3f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -817,15 +817,6 @@ static struct ctl_table kern_table[] = {
.extra1 = &zero,
.extra2 = &one,
},
- {
- .procname = "softlockup_thresh",
- .data = &softlockup_thresh,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dosoftlockup_thresh,
- .extra1 = &neg_one,
- .extra2 = &sixty,
- },
#endif
#ifdef CONFIG_DETECT_HUNG_TASK
{
diff --git a/kernel/timer.c b/kernel/timer.c
index aeb6a54..e8de5eb 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1225,7 +1225,6 @@ void run_local_timers(void)
{
hrtimer_run_queues();
raise_softirq(TIMER_SOFTIRQ);
- softlockup_tick();
}

/*
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 6b7fad8..f1541b7 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -119,13 +119,12 @@ static void __touch_watchdog(void)
__get_cpu_var(watchdog_touch_ts) = get_timestamp(this_cpu);
}

-void touch_watchdog(void)
+void touch_softlockup_watchdog(void)
{
__get_cpu_var(watchdog_touch_ts) = 0;
}
-EXPORT_SYMBOL(touch_watchdog);

-void touch_all_watchdog(void)
+void touch_all_softlockup_watchdogs(void)
{
int cpu;

@@ -140,35 +139,16 @@ void touch_all_watchdog(void)

void touch_nmi_watchdog(void)
{
- touch_watchdog();
+ touch_softlockup_watchdog();
}
EXPORT_SYMBOL(touch_nmi_watchdog);

-void touch_all_nmi_watchdog(void)
-{
- touch_all_watchdog();
-}
-
-void touch_softlockup_watchdog(void)
-{
- touch_watchdog();
-}
-
-void touch_all_softlockup_watchdogs(void)
-{
- touch_all_watchdog();
-}
-
void touch_softlockup_watchdog_sync(void)
{
__raw_get_cpu_var(softlockup_touch_sync) = true;
__raw_get_cpu_var(watchdog_touch_ts) = 0;
}

-void softlockup_tick(void)
-{
-}
-
#ifdef CONFIG_PERF_EVENTS_NMI
/* watchdog detector functions */
static int is_hardlockup(int cpu)
@@ -522,15 +502,6 @@ int proc_dowatchdog_thresh(struct ctl_table *table, int write,
{
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
}
-
-/* stub functions */
-int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos)
-{
- return proc_dowatchdog_thresh(table, write, buffer, lenp, ppos);
-}
-/* end of stub functions */
#endif /* CONFIG_SYSCTL */


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Prev: [tip:perf/nmi] watchdog: Export touch_softlockup_watchdog
Next: [tip:perf/nmi] x86: Move trigger_all_cpu_backtrace to its own die_notifier