tree 36423a9de6427ada2eb3393f1d67036902c947a1
parent 17dbe27d8446232fdc7c69e9818cce5bbc6b3e31
author Linus Torvalds <torvalds@linux-foundation.org> 1350679077 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1350679077 -0700

remap_file_pages: correctly handle the case of a NULL vm_ops pointer

In commit 0b173bc4daa8 ("mm: kill vma flag VM_CAN_NONLINEAR") we
replaced the VM_CAN_NONLINEAR test with checking whether the mapping has
a '->remap_pages()' vm operation, but there is no guarantee that there
it even has a vm_ops pointer at all.

Add the appropriate test for NULL vm_ops.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>