| Message ID | 1466523915-14644-3-git-send-email-jack@suse.cz (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
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@suse.cz> > --- > 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 >
On Fri 24-06-16 15:55:12, Ross Zwisler wrote: > 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() Thanks. Fixed. Honza
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
DAX will need to implement its own version of check_page_address(). To avoid duplicating page table walking code, export follow_pte() which does what we need. Signed-off-by: Jan Kara <jack@suse.cz> --- include/linux/mm.h | 2 ++ mm/memory.c | 5 +++-- 2 files changed, 5 insertions(+), 2 deletions(-)