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Remove duplicate macro PCI_VSEC_HDR and its related macro PCI_VSEC_HDR_LEN_SHIFT from pci_regs.h to avoid redundancy and inconsistencies. Update VFIO PCI code to use PCI_VNDR_HEADER and PCI_VNDR_HEADER_LEN() for consistent naming and functionality. These changes aim to streamline header handling while minimizing impact, given the niche usage of these macros in userspace. Link: https://lore.kernel.org/r/20241216013536.4487-1-zhangdongdong@eswincomputing.com Signed-off-by: Dongdong Zhang <zhangdongdong@eswincomputing.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Alex Williamson <alex.williamson@redhat.com>