From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752234AbaHLFbC (ORCPT ); Tue, 12 Aug 2014 01:31:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12677 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752193AbaHLFa7 (ORCPT ); Tue, 12 Aug 2014 01:30:59 -0400 From: Baoquan He To: linux-kernel@vger.kernel.org Cc: ebiederm@xmission.com, vgoyal@redhat.com, hpa@zytor.com, akpm@linux-foundation.org, Baoquan He Subject: [PATCH 2/2] check if crashk_res_low exists when exclude it from crash mem ranges Date: Tue, 12 Aug 2014 13:29:28 +0800 Message-Id: <1407821368-2358-2-git-send-email-bhe@redhat.com> In-Reply-To: <1407821368-2358-1-git-send-email-bhe@redhat.com> References: <1407821368-2358-1-git-send-email-bhe@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a check if crashk_res_low exists just like GART region does. If crashk_res_low doesn't exist, calling exclude_mem_range is unnecessary. Meanwhile, since crashk_res_low has been initialized at definition, it's safe just use "if (crashk_low_res.end)" to check if it's exist. And this can make it consistent with other places of check. Signed-off-by: Baoquan He --- arch/x86/kernel/crash.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index 0553a34..c9e83f9 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -238,7 +238,7 @@ static void fill_up_crash_elf_data(struct crash_elf_data *ced, ced->max_nr_ranges++; /* If crashk_low_res is not 0, another range split possible */ - if (crashk_low_res.end != 0) + if (crashk_low_res.end) ced->max_nr_ranges++; } @@ -336,9 +336,11 @@ static int elf_header_exclude_ranges(struct crash_elf_data *ced, if (ret) return ret; - ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end); - if (ret) - return ret; + if (crashk_low_res.end) { + ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end); + if (ret) + return ret; + } /* Exclude GART region */ if (ced->gart_end) { -- 1.8.5.3