mm: remove free_page_mlock

We should not be seeing non-0 unevictable_pgs_mlockfreed any longer.  So
remove free_page_mlock() from the page freeing paths: __PG_MLOCKED is
already in PAGE_FLAGS_CHECK_AT_FREE, so free_pages_check() will now be
checking it, reporting "BUG: Bad page state" if it's ever found set.
Comment UNEVICTABLE_MLOCKFREED and unevictable_pgs_mlockfreed always 0.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 57f7b1091511..ede4ddd46695 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -52,7 +52,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
                 UNEVICTABLE_PGMUNLOCKED,
                 UNEVICTABLE_PGCLEARED,  /* on COW, page truncate */
                 UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
-                UNEVICTABLE_MLOCKFREED,
+                UNEVICTABLE_MLOCKFREED, /* no longer useful: always zero */
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
                 THP_FAULT_ALLOC,
                 THP_FAULT_FALLBACK,