Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934099AbaKMTZi (ORCPT ); Thu, 13 Nov 2014 14:25:38 -0500 Received: from mail-yh0-f53.google.com ([209.85.213.53]:49300 "EHLO mail-yh0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933939AbaKMTZd (ORCPT ); Thu, 13 Nov 2014 14:25:33 -0500 From: Pranith Kumar To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-mm@kvack.org (open list:SLAB ALLOCATOR), linux-kernel@vger.kernel.org (open list) Cc: paulmck@linux.vnet.ibm.com Subject: [PATCH 14/16] slab: Replace smp_read_barrier_depends() with lockless_dereference() Date: Thu, 13 Nov 2014 14:24:20 -0500 Message-Id: <1415906662-4576-15-git-send-email-bobby.prani@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1415906662-4576-1-git-send-email-bobby.prani@gmail.com> References: <1415906662-4576-1-git-send-email-bobby.prani@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Recently lockless_dereference() was added which can be used in place of hard-coding smp_read_barrier_depends(). The following PATCH makes the change. Signed-off-by: Pranith Kumar --- mm/slab.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index 3347fd7..1cf40054 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -209,15 +209,15 @@ cache_from_memcg_idx(struct kmem_cache *s, int idx) rcu_read_lock(); params = rcu_dereference(s->memcg_params); - cachep = params->memcg_caches[idx]; - rcu_read_unlock(); /* * Make sure we will access the up-to-date value. The code updating * memcg_caches issues a write barrier to match this (see * memcg_register_cache()). */ - smp_read_barrier_depends(); + cachep = lockless_dereference(params->memcg_caches[idx]); + rcu_read_unlock(); + return cachep; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/