shmem: let shared anonymous be nonlinear again
Hugh Dickins [Tue, 22 Mar 2011 23:33:43 +0000 (16:33 -0700)]
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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/shmem.c

index 8859358..91ce9a1 100644 (file)
@@ -2793,5 +2793,6 @@ int shmem_zero_setup(struct vm_area_struct *vma)
                fput(vma->vm_file);
        vma->vm_file = file;
        vma->vm_ops = &shmem_vm_ops;
+       vma->vm_flags |= VM_CAN_NONLINEAR;
        return 0;
 }