This reverts commit cd544fd1dc9293c6702fab6effa63dac1cc67e99.
As discussed in [1] this commit was a no-op because the mapping type was
checked in vma_to_resize before move_vma is ever called. This meant that
vm_ops->mremap() would never be called on such mappings. Furthermore,
we've since expanded support of MREMAP_DONTUNMAP to non-anonymous
mappings, and these special mappings are still protected by the existing
check of !VM_DONTEXPAND and !VM_PFNMAP which will result in a -EINVAL.
1. https://lkml.org/lkml/2020/12/28/2340
Signed-off-by: Brian Geffon <bgeffon@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Link: https://lore.kernel.org/patchwork/patch/1401226/
Conflicts: include/linux/mm.h
(Resolved minor conflict with manual rebase)
Bug: 160737021
Bug: 169683130
Change-Id: I97d29e6a54cee07ba69d6bb880778ee1fea8ff7c
2af548dd44