mm: remove lru parameter from __pagevec_lru_add and remove parts of pagevec API

mm: remove lru parameter from __pagevec_lru_add and remove parts of pagevec API

Now that the LRU to add a page to is decided at LRU-add time, remove the
misleading lru parameter from __pagevec_lru_add.  A consequence of this
is that the pagevec_lru_add_file, pagevec_lru_add_anon and similar
helpers are misleading as the caller no longer has direct control over
what LRU the page is added to.  Unused helpers are removed by this patch
and existing users of pagevec_lru_add_file() are converted to use
lru_cache_add_file() directly and use the per-cpu pagevecs instead of
creating their own pagevec.

Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Alexey Lyahkov <[email protected]>
Cc: Andrew Perepechko <[email protected]>
Cc: Robin Dong <[email protected]>
Cc: Theodore Tso <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Bernd Schubert <[email protected]>
Cc: David Howells <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>