disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/kernel/irq/cpuhotplug.c
..
..
@@ -12,6 +12,7 @@
12
12
 #include <linux/interrupt.h>
13
13
 #include <linux/ratelimit.h>
14
14
 #include <linux/irq.h>
15
+#include <linux/sched/isolation.h>
15
16
 
16
17
 #include "internals.h"
17
18
 
..
..
@@ -41,7 +42,7 @@
41
42
 		 * If this happens then there was a missed IRQ fixup at some
42
43
 		 * point. Warn about it and enforce fixup.
43
44
 		 */
44
-		pr_warn("Eff. affinity %*pbl of IRQ %u contains only offline CPUs after offlining CPU %u\n",
45
+		pr_debug("Eff. affinity %*pbl of IRQ %u contains only offline CPUs after offlining CPU %u\n",
45
46
 			cpumask_pr_args(m), d->irq, cpu);
46
47
 		return true;
47
48
 	}
..
..
@@ -165,10 +166,24 @@
165
166
 		raw_spin_unlock(&desc->lock);
166
167
 
167
168
 		if (affinity_broken) {
168
-			pr_warn_ratelimited("IRQ %u: no longer affine to CPU%u\n",
169
+			pr_debug_ratelimited("IRQ %u: no longer affine to CPU%u\n",
169
170
 					    irq, smp_processor_id());
170
171
 		}
171
172
 	}
173
+}
174
+
175
+static bool hk_should_isolate(struct irq_data *data, unsigned int cpu)
176
+{
177
+	const struct cpumask *hk_mask;
178
+
179
+	if (!housekeeping_enabled(HK_FLAG_MANAGED_IRQ))
180
+		return false;
181
+
182
+	hk_mask = housekeeping_cpumask(HK_FLAG_MANAGED_IRQ);
183
+	if (cpumask_subset(irq_data_get_effective_affinity_mask(data), hk_mask))
184
+		return false;
185
+
186
+	return cpumask_test_cpu(cpu, hk_mask);
172
187
 }
173
188
 
174
189
 static void irq_restore_affinity_of_irq(struct irq_desc *desc, unsigned int cpu)
..
..
@@ -188,9 +203,11 @@
188
203
 	/*
189
204
 	 * If the interrupt can only be directed to a single target
190
205
 	 * CPU then it is already assigned to a CPU in the affinity
191
-	 * mask. No point in trying to move it around.
206
+	 * mask. No point in trying to move it around unless the
207
+	 * isolation mechanism requests to move it to an upcoming
208
+	 * housekeeping CPU.
192
209
 	 */
193
-	if (!irqd_is_single_target(data))
210
+	if (!irqd_is_single_target(data) || hk_should_isolate(data, cpu))
194
211
 		irq_set_affinity_locked(data, affinity, false);
195
212
 }
196
213