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Currently, Alpha's sparse/dense legacy attribute handling is done via pci_adjust_legacy_attr(), which updates dynamically allocated attributes at runtime. The upcoming conversion to static attributes needs a way to determine sparse support at visibility check time. Add a __weak pci_legacy_has_sparse() that returns false by default. Alpha overrides it to check has_sparse() on the bus host controller. Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com> Link: https://patch.msgid.link/20260508043543.217179-22-kwilczynski@kernel.org