mm: frontswap/cleancache: final flush->invalidate

From: Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: [PATCH V10 6/6] mm: frontswap/cleancache: final flush->invalidate

This sixth patch of six in this frontswap series completes the renaming
from "flush" to "invalidate" across both tmem frontends (cleancache and
frontswap) and both tmem backends (Xen and zcache), as required by akpm.
This change is completely cosmetic.

[v10: no change]
[v9: akpm@linux-foundation.org: change "flush" to "invalidate", part 3]

Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jan Beulich <JBeulich@novell.com>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Rik Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
modified for OMAP4460 by faux123