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Commit cae12402 authored by Jan Kara's avatar Jan Kara Committed by Linus Torvalds
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mm: export follow_pte() 

DAX will need to implement its own version of page_check_address().  To
avoid duplicating page table walking code, export follow_pte() which
does what we need.

Link: http://lkml.kernel.org/r/1479460644-25076-18-git-send-email-jack@suse.cz


Signed-off-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a19e2553

include/linux/mm.h

+2 −0
Original line number Diff line number Diff line
@@ -1210,6 +1210,8 @@ int copy_page_range(struct mm_struct *dst, struct mm_struct *src, 
			struct vm_area_struct *vma);

void unmap_mapping_range(struct address_space *mapping,

		loff_t const holebegin, loff_t const holelen, int even_cows);

int follow_pte(struct mm_struct *mm, unsigned long address, pte_t **ptepp,

	       spinlock_t **ptlp);

int follow_pfn(struct vm_area_struct *vma, unsigned long address,

	unsigned long *pfn);

int follow_phys(struct vm_area_struct *vma, unsigned long address,

mm/memory.c

+2 −2
Original line number Diff line number Diff line
@@ -3817,8 +3817,8 @@ static int __follow_pte(struct mm_struct *mm, unsigned long address, 
	return -EINVAL;

}



static inline int follow_pte(struct mm_struct *mm, unsigned long address,

			     pte_t **ptepp, spinlock_t **ptlp)

int follow_pte(struct mm_struct *mm, unsigned long address, pte_t **ptepp,

	       spinlock_t **ptlp)

{

	int res;