hugepage: convert huge zero page shrinker to new shrinker API

It consists of:

* returning long instead of int
* separating count from scan
* returning the number of freed entities in scan

Signed-off-by: Glauber Costa <glommer@openvz.org>
Reviewed-by: Greg Thelen <gthelen@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 11 insertions, 6 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a92012a71702..d94f7dee3997 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -211,24 +211,29 @@ static void put_huge_zero_page(void)
         BUG_ON(atomic_dec_and_test(&huge_zero_refcount));
 }
 
-static int shrink_huge_zero_page(struct shrinker *shrink,
-                struct shrink_control *sc)
+static unsigned long shrink_huge_zero_page_count(struct shrinker *shrink,
+                                        struct shrink_control *sc)
 {
-        if (!sc->nr_to_scan)
-                /* we can free zero page only if last reference remains */
-                return atomic_read(&huge_zero_refcount) == 1 ? HPAGE_PMD_NR : 0;
+        /* we can free zero page only if last reference remains */
+        return atomic_read(&huge_zero_refcount) == 1 ? HPAGE_PMD_NR : 0;
+}
 
+static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink,
+                                       struct shrink_control *sc)
+{
         if (atomic_cmpxchg(&huge_zero_refcount, 1, 0) == 1) {
                 struct page *zero_page = xchg(&huge_zero_page, NULL);
                 BUG_ON(zero_page == NULL);
                 __free_page(zero_page);
+                return HPAGE_PMD_NR;
         }
 
         return 0;
 }
 
 static struct shrinker huge_zero_page_shrinker = {
-        .shrink = shrink_huge_zero_page,
+        .count_objects = shrink_huge_zero_page_count,
+        .scan_objects = shrink_huge_zero_page_scan,
         .seeks = DEFAULT_SEEKS,
 };