slab: remove useless statement for checking pfmemalloc

[Linux-MTD Mailing List]

Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=7ecccf9d1e416fe61bb1caa0a94605b522feeaf3
Commit:     7ecccf9d1e416fe61bb1caa0a94605b522feeaf3
Parent:     8456a648cf44f14365f1f44de90a3da2526a4776
Author:     Joonsoo Kim <iamjoonsoo.kim at lge.com>
AuthorDate: Thu Oct 24 10:07:50 2013 +0900
Committer:  Pekka Enberg <penberg at iki.fi>
CommitDate: Thu Oct 24 20:17:34 2013 +0300

    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 at linux.intel.com>
    Signed-off-by: Joonsoo Kim <iamjoonsoo.kim at lge.com>
    Signed-off-by: Pekka Enberg <penberg at iki.fi>
---
 mm/slab.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

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