add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/kernel/iommu.c
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@@ -133,17 +133,28 @@
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 	return 0;
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 }
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-static struct notifier_block fail_iommu_bus_notifier = {
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+/*
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+ * PCI and VIO buses need separate notifier_block structs, since they're linked
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+ * list nodes.  Sharing a notifier_block would mean that any notifiers later
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+ * registered for PCI buses would also get called by VIO buses and vice versa.
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+ */
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+static struct notifier_block fail_iommu_pci_bus_notifier = {
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 	.notifier_call = fail_iommu_bus_notify
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 };
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+
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+#ifdef CONFIG_IBMVIO
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+static struct notifier_block fail_iommu_vio_bus_notifier = {
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+	.notifier_call = fail_iommu_bus_notify
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+};
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+#endif
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 static int __init fail_iommu_setup(void)
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 {
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 #ifdef CONFIG_PCI
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-	bus_register_notifier(&pci_bus_type, &fail_iommu_bus_notifier);
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+	bus_register_notifier(&pci_bus_type, &fail_iommu_pci_bus_notifier);
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 #endif
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 #ifdef CONFIG_IBMVIO
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-	bus_register_notifier(&vio_bus_type, &fail_iommu_bus_notifier);
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+	bus_register_notifier(&vio_bus_type, &fail_iommu_vio_bus_notifier);
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 #endif
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 	return 0;