Convert filemap_sync pagetable walkers to loops using p?d_addr_end; use
similar loop to split filemap_sync into chunks.  Merge filemap_sync_pte
into sync_pte_range, cut filemap_ off the longer names, vma arg first.

There is no error from filemap_sync, nor is any use made of the flags:
if it should do something else for MS_INVALIDATE, reinstate it when that
is implemented.  Remove the redundant flush_tlb_range from afterwards:
as its comment noted, each dirty pte has already been flushed.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>