[18/21] mm: Export follow_pte()

Commit Message

Jan Kara Nov. 4, 2016, 4:25 a.m. UTC

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.

Reviewed-by: Ross Zwisler <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>
---
 include/linux/mm.h | 2 ++
 mm/memory.c        | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 685ff1c57f2b..a5f52c0ce61a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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,
diff --git a/mm/memory.c b/mm/memory.c
index b3bd6b6c6472..7660f6169bee 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3782,8 +3782,8 @@  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;