From: Martin Schwidefsky <schwidefsky@de.ibm.com>

while searching for a s390 tlb flush problem I noticed some superflous tlb
flushes.  One in zeromap_page_range, one in remap_page_range, and another one
in filemap_sync.  The patch just adds comments but I think these three
flush_tlb_range calls can be removed.