mm: Introduce pXX_leaf_size() (560dabbd) · Commits · 戴 / test

A number of architectures have non-pagetable aligned huge/large pages. For such architectures a leaf can actually be part of a larger entry. Provide generic helpers to determine the size of a page-table leaf. Signed-off-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by:

Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lkml.kernel.org/r/20201126121121.102580109@infradead.org

include/linux/pgtable.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -1536,4 +1536,20 @@ typedef unsigned int pgtbl_mod_mask;
		#define pmd_leaf(x) 0
		#endif

		#ifndef pgd_leaf_size
		#define pgd_leaf_size(x) (1ULL << PGDIR_SHIFT)
		#endif
		#ifndef p4d_leaf_size
		#define p4d_leaf_size(x) P4D_SIZE
		#endif
		#ifndef pud_leaf_size
		#define pud_leaf_size(x) PUD_SIZE
		#endif
		#ifndef pmd_leaf_size
		#define pmd_leaf_size(x) PMD_SIZE
		#endif
		#ifndef pte_leaf_size
		#define pte_leaf_size(x) PAGE_SIZE
		#endif

		#endif /* _LINUX_PGTABLE_H */

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