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mm: clean up get_user_pages_fast() documentation

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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>
This commit is contained in:
Nick Piggin
2009-06-16 15:31:39 -07:00
committed by Linus Torvalds
parent 7ffc59b4d0
commit d2bf6be8ab
3 changed files with 67 additions and 19 deletions
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20
include/linux/mm.h
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@@ -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);
@@ -849,19 +852,6 @@ extern int mprotect_fixup(struct vm_area_struct *vma,
struct vm_area_struct **pprev, unsigned long start,
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.
*