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lockup_detector: Sync touch_*_watchdog back to old semantics
During my rewrite, the semantics of touch_nmi_watchdog and touch_softlockup_watchdog changed enough to break some drivers (mostly over preemptable regions). These are cases where long delays on one CPU (due to print_delay for example) can cause long delays on other CPUs - so we must 'touch' the nmi_watchdog flag of those other CPUs as well. This change brings those touch_*_watchdog() functions back in line with to how they used to work. Signed-off-by: Don Zickus <dzickus@redhat.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: peterz@infradead.org Cc: fweisbec@gmail.com LKML-Reference: <1283310009-22168-2-git-send-email-dzickus@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -122,7 +122,7 @@ static void __touch_watchdog(void)
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void touch_softlockup_watchdog(void)
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{
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__get_cpu_var(watchdog_touch_ts) = 0;
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__raw_get_cpu_var(watchdog_touch_ts) = 0;
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}
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EXPORT_SYMBOL(touch_softlockup_watchdog);
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@ -142,7 +142,14 @@ void touch_all_softlockup_watchdogs(void)
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#ifdef CONFIG_HARDLOCKUP_DETECTOR
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void touch_nmi_watchdog(void)
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{
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__get_cpu_var(watchdog_nmi_touch) = true;
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if (watchdog_enabled) {
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unsigned cpu;
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for_each_present_cpu(cpu) {
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if (per_cpu(watchdog_nmi_touch, cpu) != true)
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per_cpu(watchdog_nmi_touch, cpu) = true;
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}
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}
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touch_softlockup_watchdog();
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}
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EXPORT_SYMBOL(touch_nmi_watchdog);
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@ -433,6 +440,9 @@ static int watchdog_enable(int cpu)
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wake_up_process(p);
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}
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/* if any cpu succeeds, watchdog is considered enabled for the system */
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watchdog_enabled = 1;
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return 0;
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}
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@ -455,9 +465,6 @@ static void watchdog_disable(int cpu)
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per_cpu(softlockup_watchdog, cpu) = NULL;
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kthread_stop(p);
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}
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/* if any cpu succeeds, watchdog is considered enabled for the system */
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watchdog_enabled = 1;
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}
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static void watchdog_enable_all_cpus(void)
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