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>

diff --git a/mm/slab.c b/mm/slab.c
index 0e7f2e7..fbb594f 100644 (file)
--- 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);
        }