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uapi/linux/pci_regs.h defines Primary/Secondary/Subordinate Bus Numbers and Secondary Latency Timer (PCIe r7.0, sec. 7.5.1.3) as byte register offsets, but in practice the code may read/write the entire dword. In the lack of #defines to handle the dword fields, the code ends up using literals which are not as easy to read. Add dword field masks for the Bus Number and Secondary Latency Timer fields and use them in probe.c. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> [bhelgaas: squash new #defines and uses together] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://patch.msgid.link/20251219174036.16738-21-ilpo.jarvinen@linux.intel.com Link: https://patch.msgid.link/20251219174036.16738-22-ilpo.jarvinen@linux.intel.com