slab: remove useless statement for checking pfmemalloc

Now, virt_to_page(page->s_mem) is same as the page,
because slab use this structure for management.
So remove useless statement.

Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@iki.fi>

1 files changed, 3 insertions, 6 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 0e7f2e73e08e..fbb594f2259a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -750,9 +750,7 @@ static struct array_cache *alloc_arraycache(int node, int entries,
 
 static inline bool is_slab_pfmemalloc(struct page *page)
 {
-        struct page *mem_page = virt_to_page(page->s_mem);
-
-        return PageSlabPfmemalloc(mem_page);
+        return PageSlabPfmemalloc(page);
 }
 
 /* Clears pfmemalloc_active if no slabs have pfmalloc set */
@@ -817,7 +815,7 @@ static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac,
                 n = cachep->node[numa_mem_id()];
                 if (!list_empty(&n->slabs_free) && force_refill) {
                         struct page *page = virt_to_head_page(objp);
-                        ClearPageSlabPfmemalloc(virt_to_head_page(page->s_mem));
+                        ClearPageSlabPfmemalloc(page);
                         clear_obj_pfmemalloc(&objp);
                         recheck_pfmemalloc_active(cachep, ac);
                         return objp;
@@ -850,8 +848,7 @@ static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
         if (unlikely(pfmemalloc_active)) {
                 /* Some pfmemalloc slabs exist, check if this is one */
                 struct page *page = virt_to_head_page(objp);
-                struct page *mem_page = virt_to_head_page(page->s_mem);
-                if (PageSlabPfmemalloc(mem_page))
+                if (PageSlabPfmemalloc(page))
                         set_obj_pfmemalloc(&objp);
         }