linux-kernel - [PATCH 14/16] mm/slab: factor out slab list fixup code

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Date:	Thu, 14 Jan 2016 14:24:27 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 14/16] mm/slab: factor out slab list fixup code

Slab list should be fixed up after object is detached from the slab
and this happens at two places. They do exactly same thing. They will
be changed in the following patch, so, to reduce code duplication,
this patch factor out them and make it common function.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/slab.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index e86977e..dbf18ed 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2724,6 +2724,17 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 #define cache_free_debugcheck(x,objp,z) (objp)
 #endif
 
+static inline void fixup_slab_list(struct kmem_cache *cachep,
+				struct kmem_cache_node *n, struct page *page)
+{
+	/* move slabp to correct slabp list: */
+	list_del(&page->lru);
+	if (page->active == cachep->num)
+		list_add(&page->lru, &n->slabs_full);
+	else
+		list_add(&page->lru, &n->slabs_partial);
+}
+
 static struct page *get_first_slab(struct kmem_cache_node *n)
 {
 	struct page *page;
@@ -2797,12 +2808,7 @@ retry:
 			ac_put_obj(cachep, ac, slab_get_obj(cachep, page));
 		}
 
-		/* move slabp to correct slabp list: */
-		list_del(&page->lru);
-		if (page->active == cachep->num)
-			list_add(&page->lru, &n->slabs_full);
-		else
-			list_add(&page->lru, &n->slabs_partial);
+		fixup_slab_list(cachep, n, page);
 	}
 
 must_grow:
@@ -3076,13 +3082,8 @@ retry:
 
 	obj = slab_get_obj(cachep, page);
 	n->free_objects--;
-	/* move slabp to correct slabp list: */
-	list_del(&page->lru);
 
-	if (page->active == cachep->num)
-		list_add(&page->lru, &n->slabs_full);
-	else
-		list_add(&page->lru, &n->slabs_partial);
+	fixup_slab_list(cachep, n, page);
 
 	spin_unlock(&n->list_lock);
 	goto done;
-- 
1.9.1