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mm: Introduce pXX_leaf_size()

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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
This commit is contained in:
Peter Zijlstra 2020-11-13 11:45:36 +01:00
parent 2a4a06da8a
commit 560dabbdf6
1 changed files with 16 additions and 0 deletions
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16
include/linux/pgtable.h
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@ -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 */