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authorHugh Dickins <hughd@google.com>2011-03-22 16:33:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:09 -0700
commitbee4c36a5cf5c9f63ce1d7372aa62045fbd16d47 (patch)
treed2c95aab9b12874d6675d529c3f8dd5cd2a35e10
parent8f7a66051b7523108c5aefb08c6a637e54aedc47 (diff)
shmem: let shared anonymous be nonlinear again
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>
-rw-r--r--mm/shmem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 88593586bdb7..91ce9a1024d7 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -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;
}