x86/PCI: use RCU list to protect mmconfig list
Use RCU list to protect mmconfig list from dynamic change when supporting PCI host bridge hotplug. Reviewed-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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