lockup_detector: Introduce CONFIG_HARDLOCKUP_DETECTOR
This new config is deemed to simplify even more the lockup detector
dependencies and can make it easier to bring a smooth sorting
between archs that support the new generic lockup detector and those
that still have their own, especially for those that are in the
middle of this migration.
Instead of checking whether we have CONFIG_LOCKUP_DETECTOR +
CONFIG_PERF_EVENTS_NMI each time an arch wants to know if it needs
to build its own lockup detector, take a shortcut with this new
config. It is enabled only if the hardlockup detection part of
the whole lockup detector is on.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.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>
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index be5e74e..83fb631 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -37,7 +37,7 @@
static DEFINE_PER_CPU(bool, softlockup_touch_sync);
static DEFINE_PER_CPU(bool, hard_watchdog_warn);
static DEFINE_PER_CPU(bool, soft_watchdog_warn);
-#ifdef CONFIG_PERF_EVENTS_NMI
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts);
static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
@@ -51,7 +51,7 @@
/*
* Should we panic when a soft-lockup or hard-lockup occurs:
*/
-#ifdef CONFIG_PERF_EVENTS_NMI
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
static int hardlockup_panic;
static int __init hardlockup_panic_setup(char *str)
@@ -152,7 +152,7 @@
__raw_get_cpu_var(watchdog_touch_ts) = 0;
}
-#ifdef CONFIG_PERF_EVENTS_NMI
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
/* watchdog detector functions */
static int is_hardlockup(int cpu)
{
@@ -189,7 +189,7 @@
.notifier_call = watchdog_panic,
};
-#ifdef CONFIG_PERF_EVENTS_NMI
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
static struct perf_event_attr wd_hw_attr = {
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES,
@@ -239,7 +239,7 @@
}
#else
static inline void watchdog_interrupt_count(void) { return; }
-#endif /* CONFIG_PERF_EVENTS_NMI */
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
/* watchdog kicker functions */
static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
@@ -342,7 +342,7 @@
}
-#ifdef CONFIG_PERF_EVENTS_NMI
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
static int watchdog_nmi_enable(int cpu)
{
struct perf_event_attr *wd_attr;
@@ -393,7 +393,7 @@
#else
static int watchdog_nmi_enable(int cpu) { return 0; }
static void watchdog_nmi_disable(int cpu) { return; }
-#endif /* CONFIG_PERF_EVENTS_NMI */
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
/* prepare/enable/disable routines */
static int watchdog_prepare_cpu(int cpu)