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Matt Turner
7ab5de838d
Add _PAGE_SPECIAL using bit 19 (0x80000), which is unused in the Alpha PTE layout. This enables pte_special()/pte_mkspecial() for marking PTEs that are not backed by struct page (VDSO mappings, zero page, io_remap_pfn_range, etc.). Include _PAGE_SPECIAL in _PAGE_CHG_MASK so it is preserved across pte_modify() calls. Also mark Alpha as "ok" in the pte_special feature matrix. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner <mattst88@gmail.com> Tested-by: Magnus Lindholm <linmag7@gmail.com> Reviewed-by: Magnus Lindholm <linmag7@gmail.com> Link: https://lore.kernel.org/r/20260905-arch-kconfig-options-v2-v2-12-83e8245761a2@gmail.com Signed-off-by: Magnus Lindholm <linmag7@gmail.com>