[PATCHv5 2/7] slub: use page->rcu_head instead of page->lru plus cast

From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@suse.cz>,
	David Rientjes <rientjes@google.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Christoph Lameter <cl@linux.com>
Subject: [PATCHv5 2/7] slub: use page->rcu_head instead of page->lru plus cast
Date: Thu,  3 Sep 2015 15:35:53 +0300	[thread overview]
Message-ID: <1441283758-92774-3-git-send-email-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <1441283758-92774-1-git-send-email-kirill.shutemov@linux.intel.com>

We have properly typed page->rcu_head, no need to cast page->lru.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
---
 mm/slub.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 816df0016555..869642d03b22 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1510,10 +1510,7 @@ static void free_slab(struct kmem_cache *s, struct page *page)
 			VM_BUG_ON(s->reserved != sizeof(*head));
 			head = page_address(page) + offset;
 		} else {
-			/*
-			 * RCU free overloads the RCU head over the LRU
-			 */
-			head = (void *)&page->lru;
+			head = &page->rcu_head;
 		}
 
 		call_rcu(head, rcu_free_slab);
-- 
2.5.0

