On Tue, Jun 21, 2016 at 05:45:14PM +0200, Jan Kara wrote:
> DAX will need to implement its own version of check_page_address(). To
page_check_address()
> avoid duplicating page table walking code, export follow_pte() which
> does what we need.
>
> Signed-off-by: Jan Kara <jack@xxxxxxx>
> ---
> 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 5df5feb49575..989f5d949db3 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1193,6 +1193,8 @@ 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 15322b73636b..f6175d63c2e9 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3647,8 +3647,8 @@ 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;
>
> @@ -3657,6 +3657,7 @@ 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
>
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