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| author |   Nick Piggin <nickpiggin@yahoo.com.au> | 2009-06-16 15:31:39 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-16 19:47:30 -0700 |
| commit | d2bf6be8ab63aa84e6149aac934649aadf3828b1 (patch) | |
| tree | 65e7f74f1ed6fd9516f1615b0f293d2aaeede07b /include/linux/mm.h | |
| parent | readahead: enforce full sync mmap readahead size (diff) | |
| download | linux-dev-d2bf6be8ab63aa84e6149aac934649aadf3828b1.tar.xz linux-dev-d2bf6be8ab63aa84e6149aac934649aadf3828b1.zip | |
mm: clean up get_user_pages_fast() documentation
Move more documentation for get_user_pages_fast into the new kerneldoc comment.
Add some comments for get_user_pages as well.
Also, move get_user_pages_fast declaration up to get_user_pages. It wasn't
there initially because it was once a static inline function.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Andy Grover <andy.grover@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 33da7f538841..a880161a3854 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -824,8 +824,11 @@ static inline int handle_mm_fault(struct mm_struct *mm, extern int make_pages_present(unsigned long addr, unsigned long end); extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); -int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, - int len, int write, int force, struct page **pages, struct vm_area_struct **vmas); +int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, int len, int write, int force, + struct page **pages, struct vm_area_struct **vmas); +int get_user_pages_fast(unsigned long start, int nr_pages, int write, + struct page **pages); extern int try_to_release_page(struct page * page, gfp_t gfp_mask); extern void do_invalidatepage(struct page *page, unsigned long offset); @@ -850,19 +853,6 @@ extern int mprotect_fixup(struct vm_area_struct *vma, unsigned long end, unsigned long newflags); /* - * get_user_pages_fast provides equivalent functionality to get_user_pages, - * operating on current and current->mm (force=0 and doesn't return any vmas). - * - * get_user_pages_fast may take mmap_sem and page tables, so no assumptions - * can be made about locking. get_user_pages_fast is to be implemented in a - * way that is advantageous (vs get_user_pages()) when the user memory area is - * already faulted in and present in ptes. However if the pages have to be - * faulted in, it may turn out to be slightly slower). - */ -int get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages); - -/* * A callback you can register to apply pressure to ageable caches. * * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |