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.
Signed-off-by: Jan Kara <[email protected]> --- include/linux/mm.h | 2 ++ mm/memory.c | 5 +++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index d2f2816d78ca..daf690fccc0c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1191,6 +1191,8 @@ 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 cfae2d5cc1e0..6780e5d8145c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3635,8 +3635,8 @@ out: 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; @@ -3645,6 +3645,7 @@ static inline int follow_pte(struct mm_struct *mm, unsigned long address, !(res = __follow_pte(mm, address, ptepp, ptlp))); return res; } +EXPORT_SYMBOL(follow_pte); /** * follow_pfn - look up PFN at a user virtual address -- 2.6.6 _______________________________________________ Linux-nvdimm mailing list [email protected] https://lists.01.org/mailman/listinfo/linux-nvdimm
