From: Pekka Enberg <[EMAIL PROTECTED]>
As pointed out by Nick Piggin, __revoke_break_cow() only needs to do
down_read() and we must use vma_pages() for get_user_pages().
Cc: Nick Piggin <[EMAIL PROTECTED]>
Signed-off-by: Pekka Enberg <[EMAIL PROTECTED]>
---
fs/revoke.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
Index: uml-2.6/fs/revoke.c
===================================================================
--- uml-2.6.orig/fs/revoke.c 2007-03-28 12:25:29.000000000 +0300
+++ uml-2.6/fs/revoke.c 2007-03-28 12:54:49.000000000 +0300
@@ -184,7 +184,7 @@ static int __revoke_break_cow(struct tas
struct vm_area_struct *vma;
int err = 0;
- down_write(&mm->mmap_sem);
+ down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma != NULL; vma = vma->vm_next) {
int ret;
@@ -195,14 +195,13 @@ int err = 0;
continue;
ret = get_user_pages(tsk, tsk->mm, vma->vm_start,
- vma->vm_end-vma->vm_start, 1, 1, NULL,
- NULL);
+ vma_pages(vma), 1, 1, NULL, NULL);
if (ret < 0) {
err = ret;
break;
}
}
- up_write(&mm->mmap_sem);
+ up_read(&mm->mmap_sem);
return err;
}
-
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