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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/arch/x86/xen/smp.c
..
..
@@ -88,14 +88,17 @@
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 	per_cpu(xen_callfunc_irq, cpu).irq = rc;
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 	per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
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90
 
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-	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
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-	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
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-				     IRQF_PERCPU | IRQF_NOBALANCING,
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-				     debug_name, NULL);
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-	if (rc < 0)
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-		goto fail;
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-	per_cpu(xen_debug_irq, cpu).irq = rc;
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-	per_cpu(xen_debug_irq, cpu).name = debug_name;
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+	if (!xen_fifo_events) {
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+		debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
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+		rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu,
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+					     xen_debug_interrupt,
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+					     IRQF_PERCPU | IRQF_NOBALANCING,
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+					     debug_name, NULL);
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+		if (rc < 0)
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+			goto fail;
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+		per_cpu(xen_debug_irq, cpu).irq = rc;
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+		per_cpu(xen_debug_irq, cpu).name = debug_name;
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+	}
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 	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
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 	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
..
..
@@ -132,7 +135,7 @@
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 		if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
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 			continue;
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137
 
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-		rc = cpu_down(cpu);
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+		rc = remove_cpu(cpu);
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139
 
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 		if (rc == 0) {
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 			/*