vcsm: Revert to do page-table-walk-based cache manipulating on some ioctl calls
On FLUSH, INVALID, CLEAN_INVALID ioctl calls, cache operations based on
page table walk were used in case that the buffer of the cache is not
pinned. So reverted to do page-table-based cache manipulating.
Signed-off-by:
Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
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