Commit bee4c36a authored Mar 22, 2011 by Hugh Dickins Committed by Linus Torvalds Mar 22, 2011

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>

parent 8f7a6605

mm/shmem.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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