From 560dabbdf68bb15f9e241af8f828b1c8c38d6c6f Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 13 Nov 2020 11:45:36 +0100 Subject: [PATCH] mm: Introduce pXX_leaf_size() 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) Reviewed-by: Matthew Wilcox (Oracle) Link: https://lkml.kernel.org/r/20201126121121.102580109@infradead.org --- include/linux/pgtable.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index ed9266cc115ba..fefbbdbbb3f34 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -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 */ -- 2.39.5