linux-kernel - [PATCH 3/5] watchdog: Remove touch_all_softlockup

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Message-Id: <1324502265-24521-4-git-send-email-dzickus@redhat.com>
Date:	Wed, 21 Dec 2011 16:17:43 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	avi@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	tglx@...utronix.de, Anton Blanchard <anton@...ba.org>,
	Don Zickus <dzickus@...hat.com>
Subject: [PATCH 3/5] watchdog: Remove touch_all_softlockup_watchdogs

From: Anton Blanchard <anton@...ba.org>

commit 04c9167f91e3 (add touch_all_softlockup_watchdogs()) added a
way to touch the watchdog on all cpus because show_state_filter
could hold the tasklist_lock for extended periods of time.

commit 510f5acc4f4f (sched: Don't use tasklist_lock for debug prints)
has since removed the tasklist_lock in show_state_filter so we can
use touch_softlockup_watchdog instead.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Don Zickus <dzickus@...hat.com>
---
 include/linux/sched.h |    4 ----
 kernel/sched/core.c   |    2 +-
 kernel/watchdog.c     |   13 -------------
 3 files changed, 1 insertions(+), 18 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index cc8c620..b1e4364 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -312,7 +312,6 @@ extern void sched_show_task(struct task_struct *p);
 #ifdef CONFIG_LOCKUP_DETECTOR
 extern void touch_softlockup_watchdog(void);
 extern void touch_softlockup_watchdog_sync(void);
-extern void touch_all_softlockup_watchdogs(void);
 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
 				  void __user *buffer,
 				  size_t *lenp, loff_t *ppos);
@@ -325,9 +324,6 @@ static inline void touch_softlockup_watchdog(void)
 static inline void touch_softlockup_watchdog_sync(void)
 {
 }
-static inline void touch_all_softlockup_watchdogs(void)
-{
-}
 static inline void lockup_detector_init(void)
 {
 }
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3c5b21e..4b01286 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4812,7 +4812,7 @@ void show_state_filter(unsigned long state_filter)
 			sched_show_task(p);
 	} while_each_thread(g, p);
 
-	touch_all_softlockup_watchdogs();
+	touch_softlockup_watchdog();
 
 #ifdef CONFIG_SCHED_DEBUG
 	sysrq_sched_debug_show();
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 1d7bca7..d63975f 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -138,19 +138,6 @@ void touch_softlockup_watchdog(void)
 }
 EXPORT_SYMBOL(touch_softlockup_watchdog);
 
-void touch_all_softlockup_watchdogs(void)
-{
-	int cpu;
-
-	/*
-	 * this is done lockless
-	 * do we care if a 0 races with a timestamp?
-	 * all it means is the softlock check starts one cycle later
-	 */
-	for_each_online_cpu(cpu)
-		per_cpu(watchdog_touch_ts, cpu) = 0;
-}
-
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 void touch_nmi_watchdog(void)
 {
-- 
1.7.7.4

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