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authorPeter Zijlstra <peterz@infradead.org>2009-06-25 11:58:55 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-25 11:22:13 -0700
commit9d73777e500929b71dcfed16eec05f6760e345a6 (patch)
tree7b2d0e7a619b4a5c994ca8789e680f6e7642849c /mm/memory.c
parentab420e6d9c2511b862d753b70efb4e979faa0714 (diff)
clarify get_user_pages() prototype
Currently the 4th parameter of get_user_pages() is called len, but its in pages, not bytes. Rename the thing to nr_pages to avoid future confusion. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/mm/memory.c b/mm/memory.c
index f46ac18ba231..65216194eb8d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1207,8 +1207,8 @@ static inline int use_zero_page(struct vm_area_struct *vma)
int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int len, int flags,
- struct page **pages, struct vm_area_struct **vmas)
+ unsigned long start, int nr_pages, int flags,
+ struct page **pages, struct vm_area_struct **vmas)
{
int i;
unsigned int vm_flags = 0;
@@ -1217,7 +1217,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
int ignore_sigkill = !!(flags & GUP_FLAGS_IGNORE_SIGKILL);
- if (len <= 0)
+ if (nr_pages <= 0)
return 0;
/*
* Require read or write permissions.
@@ -1269,7 +1269,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
vmas[i] = gate_vma;
i++;
start += PAGE_SIZE;
- len--;
+ nr_pages--;
continue;
}
@@ -1280,7 +1280,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (is_vm_hugetlb_page(vma)) {
i = follow_hugetlb_page(mm, vma, pages, vmas,
- &start, &len, i, write);
+ &start, &nr_pages, i, write);
continue;
}
@@ -1357,9 +1357,9 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
vmas[i] = vma;
i++;
start += PAGE_SIZE;
- len--;
- } while (len && start < vma->vm_end);
- } while (len);
+ nr_pages--;
+ } while (nr_pages && start < vma->vm_end);
+ } while (nr_pages);
return i;
}
@@ -1368,7 +1368,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
* @tsk: task_struct of target task
* @mm: mm_struct of target mm
* @start: starting user address
- * @len: number of pages from start to pin
+ * @nr_pages: number of pages from start to pin
* @write: whether pages will be written to by the caller
* @force: whether to force write access even if user mapping is
* readonly. This will result in the page being COWed even
@@ -1380,7 +1380,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
* Or NULL if the caller does not require them.
*
* Returns number of pages pinned. This may be fewer than the number
- * requested. If len is 0 or negative, returns 0. If no pages
+ * requested. If nr_pages is 0 or negative, returns 0. If no pages
* were pinned, returns -errno. Each page returned must be released
* with a put_page() call when it is finished with. vmas will only
* remain valid while mmap_sem is held.
@@ -1414,7 +1414,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
* See also get_user_pages_fast, for performance critical applications.
*/
int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int len, int write, int force,
+ unsigned long start, int nr_pages, int write, int force,
struct page **pages, struct vm_area_struct **vmas)
{
int flags = 0;
@@ -1424,9 +1424,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (force)
flags |= GUP_FLAGS_FORCE;
- return __get_user_pages(tsk, mm,
- start, len, flags,
- pages, vmas);
+ return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas);
}
EXPORT_SYMBOL(get_user_pages);