| From bee4c36a5cf5c9f63ce1d7372aa62045fbd16d47 Mon Sep 17 00:00:00 2001 |
| From: Hugh Dickins <hughd@google.com> |
| Date: Tue, 22 Mar 2011 16:33:43 -0700 |
| Subject: shmem: let shared anonymous be nonlinear again |
| |
| From: Hugh Dickins <hughd@google.com> |
| |
| commit bee4c36a5cf5c9f63ce1d7372aa62045fbd16d47 upstream. |
| |
| Up to 2.6.22, you could use remap_file_pages(2) on a tmpfs file or a |
| shared mapping of /dev/zero or a shared anonymous mapping. In 2.6.23 we |
| disabled it by default, but set VM_CAN_NONLINEAR to enable it on safe |
| mappings. We made sure to set it in shmem_mmap() for tmpfs files, but |
| missed it in shmem_zero_setup() for the others. Fix that at last. |
| |
| Reported-by: Kenny Simpson <theonetruekenny@yahoo.com> |
| Signed-off-by: Hugh Dickins <hughd@google.com> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| mm/shmem.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/mm/shmem.c |
| +++ b/mm/shmem.c |
| @@ -2701,5 +2701,6 @@ int shmem_zero_setup(struct vm_area_stru |
| fput(vma->vm_file); |
| vma->vm_file = file; |
| vma->vm_ops = &shmem_vm_ops; |
| + vma->vm_flags |= VM_CAN_NONLINEAR; |
| return 0; |
| } |
