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From: Costa Shulyupin <costa.shul@redhat.com>
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Subject: [PATCH v1 5/7] [NOT-FOR-MERGE] test timers affinity adjustment
Date: Thu, 16 May 2024 22:04:35 +0300
Message-ID: <20240516190437.3545310-6-costa.shul@redhat.com>
In-Reply-To: <20240516190437.3545310-1-costa.shul@redhat.com>
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There must be no timers on the specified cpu
at the end of timers_resettle_from_cpu.

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
---
 kernel/time/timer.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2d15c0e7b0550..b7d253d230453 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2658,6 +2658,27 @@ int timers_prepare_cpu(unsigned int cpu)
 	return 0;
 }
 
+static int count_timers(int cpu)
+{
+	struct timer_base *base;
+	int b, v, count = 0;
+
+	for (b = 0; b < NR_BASES; b++) {
+		base = per_cpu_ptr(&timer_bases[b], cpu);
+		raw_spin_lock_irq(&base->lock);
+
+		for (v = 0; v < WHEEL_SIZE; v++) {
+			struct hlist_node *c;
+
+			hlist_for_each(c, base->vectors + v)
+				count++;
+		}
+		raw_spin_unlock_irq(&base->lock);
+	}
+
+	return count;
+}
+
 /**
  * timers_resettle_from_cpu - resettles timers from
  * specified cpu to housekeeping cpus.
@@ -2697,6 +2718,7 @@ void timers_resettle_from_cpu(unsigned int cpu)
 		raw_spin_unlock_irq(&new_base->lock);
 	}
 	local_irq_enable();
+	WARN_ON(count_timers(cpu));
 }
 
 int timers_dead_cpu(unsigned int cpu)
-- 
2.45.0