Commit 560dabbd authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

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: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lkml.kernel.org/r/20201126121121.102580109@infradead.org
parent 2a4a06da

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 */