diff options
author | Johannes Weiner <hannes@cmpxchg.org> | 2009-06-16 18:32:35 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-16 22:47:40 -0400 |
commit | 3b6748e2dd69906af3835db4dc9d1c8a3ee4c68c (patch) | |
tree | 5d5476844f8e29e31684ce8ccf7e163ab3182ad6 /include | |
parent | 03668a4debf4f50de55c34b6e66dae63e1c73716 (diff) |
mm: introduce follow_pfn()
Analoguous to follow_phys(), add a helper that looks up the PFN at a
user virtual address in an IO mapping or a raw PFN mapping.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Acked-by: Magnus Damm <magnus.damm@gmail.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/mm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 7b548e7cfbd9..c80dbd4a62c6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h | |||
@@ -792,6 +792,8 @@ int copy_page_range(struct mm_struct *dst, struct mm_struct *src, | |||
792 | struct vm_area_struct *vma); | 792 | struct vm_area_struct *vma); |
793 | void unmap_mapping_range(struct address_space *mapping, | 793 | void unmap_mapping_range(struct address_space *mapping, |
794 | loff_t const holebegin, loff_t const holelen, int even_cows); | 794 | loff_t const holebegin, loff_t const holelen, int even_cows); |
795 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, | ||
796 | unsigned long *pfn); | ||
795 | int follow_phys(struct vm_area_struct *vma, unsigned long address, | 797 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
796 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | 798 | unsigned int flags, unsigned long *prot, resource_size_t *phys); |
797 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, | 799 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |