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| author | Johannes Weiner <hannes@cmpxchg.org> | 2009-06-16 15:32:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-16 19:47:40 -0700 |
| commit | 3b6748e2dd69906af3835db4dc9d1c8a3ee4c68c (patch) | |
| tree | 5d5476844f8e29e31684ce8ccf7e163ab3182ad6 /include | |
| parent | 03668a4debf4f50de55c34b6e66dae63e1c73716 (diff) | |
| download | linux-stable-3b6748e2dd69906af3835db4dc9d1c8a3ee4c68c.tar.gz linux-stable-3b6748e2dd69906af3835db4dc9d1c8a3ee4c68c.tar.bz2 linux-stable-3b6748e2dd69906af3835db4dc9d1c8a3ee4c68c.zip | |
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, 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_pfn(struct vm_area_struct *vma, unsigned long address, + unsigned long *pfn); int follow_phys(struct vm_area_struct *vma, unsigned long address, unsigned int flags, unsigned long *prot, resource_size_t *phys); int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |