[PATCH v6 09/19] mm: Add generic p?d_large() macros
From: Steven Price <steven.price@arm.com>
Date: 2019-03-26 16:27:13
Also in:
linux-mm, lkml
Subsystem:
generic include/asm header files, the rest · Maintainers:
Arnd Bergmann, Linus Torvalds
Exposing the pud/pgd levels of the page tables to walk_page_range() means we may come across the exotic large mappings that come with large areas of contiguous memory (such as the kernel's linear map). For architectures that don't provide p?d_large() macros, provide generic does nothing defaults. Signed-off-by: Steven Price <steven.price@arm.com> --- include/asm-generic/pgtable.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index fa782fba51ee..9c5d0f73db67 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h@@ -1186,4 +1186,23 @@ static inline bool arch_has_pfn_modify_check(void) #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) #endif +/* + * p?d_large() - true if this entry is a final mapping to a physical address. + * This differs from p?d_huge() by the fact that they are always available (if + * the architecture supports large pages at the appropriate level) even + * if CONFIG_HUGETLB_PAGE is not defined. + */ +#ifndef pgd_large +#define pgd_large(x) 0 +#endif +#ifndef p4d_large +#define p4d_large(x) 0 +#endif +#ifndef pud_large +#define pud_large(x) 0 +#endif +#ifndef pmd_large +#define pmd_large(x) 0 +#endif + #endif /* _ASM_GENERIC_PGTABLE_H */
--
2.20.1
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