From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934176AbcBDF6Q (ORCPT ); Thu, 4 Feb 2016 00:58:16 -0500 Received: from mail-pf0-f172.google.com ([209.85.192.172]:35548 "EHLO mail-pf0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934132AbcBDF5f (ORCPT ); Thu, 4 Feb 2016 00:57:35 -0500 From: Joonsoo Kim X-Google-Original-From: Joonsoo Kim 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 2/5] mm/slub: query dynamic DEBUG_PAGEALLOC setting Date: Thu, 4 Feb 2016 14:56:23 +0900 Message-Id: <1454565386-10489-3-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1454565386-10489-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1454565386-10489-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We can disable debug_pagealloc processing even if the code is complied with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query whether it is enabled or not in runtime. Signed-off-by: Joonsoo Kim --- mm/slub.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 7d4da68..7b5a965 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -256,11 +256,12 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) { void *p; -#ifdef CONFIG_DEBUG_PAGEALLOC - probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); -#else - p = get_freepointer(s, object); -#endif + if (debug_pagealloc_enabled()) { + probe_kernel_read(&p, + (void **)(object + s->offset), sizeof(p)); + } else + p = get_freepointer(s, object); + return p; } -- 1.9.1