add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/xen/spinlock.c
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@@ -75,6 +75,7 @@
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 	     cpu, per_cpu(lock_kicker_irq, cpu));
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 	name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
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+	per_cpu(irq_name, cpu) = name;
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 	irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
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 				     cpu,
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 				     dummy_handler,
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@@ -85,7 +86,6 @@
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 	if (irq >= 0) {
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 		disable_irq(irq); /* make sure it's never delivered */
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 		per_cpu(lock_kicker_irq, cpu) = irq;
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-		per_cpu(irq_name, cpu) = name;
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 	}
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 	printk("cpu %d spinlock event irq %d\n", cpu, irq);
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@@ -98,6 +98,8 @@
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 	if (!xen_pvspin)
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 		return;
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+	kfree(per_cpu(irq_name, cpu));
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+	per_cpu(irq_name, cpu) = NULL;
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 	/*
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 	 * When booting the kernel with 'mitigations=auto,nosmt', the secondary
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 	 * CPUs are not activated, and lock_kicker_irq is not initialized.
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@@ -108,8 +110,6 @@
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 	unbind_from_irqhandler(irq, NULL);
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 	per_cpu(lock_kicker_irq, cpu) = -1;
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-	kfree(per_cpu(irq_name, cpu));
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-	per_cpu(irq_name, cpu) = NULL;
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 }
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 PV_CALLEE_SAVE_REGS_THUNK(xen_vcpu_stolen);