The patch titled
softlockup: fix a potential race condition in watchdog()
has been removed from the -mm tree. Its filename was
softlockup-fix-a-potential-race-condition-in-watchdog.patch
This patch was dropped because it is obsolete
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: softlockup: fix a potential race condition in watchdog()
From: Dmitry Adamushko <dmitry.adamushko@xxxxxxxxx>
kthread_stop() can be called when a 'watchdog' thread is executing after
kthread_should_stop() but before set_task_state(TASK_INTERRUPTIBLE).
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/softlockup.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN kernel/softlockup.c~softlockup-fix-a-potential-race-condition-in-watchdog kernel/softlockup.c
--- a/kernel/softlockup.c~softlockup-fix-a-potential-race-condition-in-watchdog
+++ a/kernel/softlockup.c
@@ -98,6 +98,7 @@ void softlockup_tick(void)
touch_softlockup_watchdog();
return;
}
+ printk(KERN_ERR "watchdog(cpu: %d) -- exit\n", this_cpu);
now = get_timestamp(this_cpu);
@@ -289,6 +290,7 @@ cpu_callback(struct notifier_block *nfb,
case CPU_DEAD_FROZEN:
p = per_cpu(watchdog_task, hotcpu);
per_cpu(watchdog_task, hotcpu) = NULL;
+ printk(KERN_ERR "kthread_stop(watchdog on cpu: %d)\n", hotcpu);
kthread_stop(p);
break;
#endif /* CONFIG_HOTPLUG_CPU */
_
Patches currently in -mm which might be from dmitry.adamushko@xxxxxxxxx are
origin.patch
softlockup-fix-a-potential-race-condition-in-watchdog.patch
softlockup-fix-a-potential-race-condition-in-watchdog-2.patch
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