From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752687AbcBKEGN (ORCPT ); Wed, 10 Feb 2016 23:06:13 -0500 Received: from mail-pa0-f68.google.com ([209.85.220.68]:33041 "EHLO mail-pa0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751422AbcBKEFU (ORCPT ); Wed, 10 Feb 2016 23:05:20 -0500 From: js1304@gmail.com X-Google-Original-From: iamjoonsoo.kim@lge.com To: Andrew Morton Cc: David Rientjes , Christian Borntraeger , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Benjamin Herrenschmidt , Takashi Iwai , Chris Metcalf , Christoph Lameter , linux-api@vger.kernel.org, Joonsoo Kim Subject: [PATCH v2 2/5] mm/slub: query dynamic DEBUG_PAGEALLOC setting Date: Thu, 11 Feb 2016 13:04:58 +0900 Message-Id: <1455163501-9341-3-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1455163501-9341-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1455163501-9341-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joonsoo Kim We can disable debug_pagealloc processing even if the code is compiled with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query whether it is enabled or not in runtime. v2: clean up code, per Christian. Signed-off-by: Joonsoo Kim --- mm/slub.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 606488b..a1874c2 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -250,11 +250,10 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) { void *p; -#ifdef CONFIG_DEBUG_PAGEALLOC + if (!debug_pagealloc_enabled()) + return get_freepointer(s, object); + probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); -#else - p = get_freepointer(s, object); -#endif return p; } -- 1.9.1