From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755862Ab3EXNIR (ORCPT ); Fri, 24 May 2013 09:08:17 -0400 Received: from e06smtp16.uk.ibm.com ([195.75.94.112]:58072 "EHLO e06smtp16.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754970Ab3EXNIO (ORCPT ); Fri, 24 May 2013 09:08:14 -0400 From: Michael Holzheu To: Vivek Goyal , HATAYAMA Daisuke Cc: Jan Willeke , Martin Schwidefsky , Heiko Carstens , linux-kernel@vger.kernel.org, kexec@lists.infradead.org Subject: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Date: Fri, 24 May 2013 15:08:07 +0200 Message-Id: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.6 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13052413-3548-0000-0000-0000057CA38E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Vivek and Hatayama, Currently the /proc/vmcore mmap patches are not working on s390. The problem is that on s390 the kernel in not relocatable and therefore always runs in the lower memory area. Therefore for kdump on s390 we swap the lower memory area with the crashkernel area before starting the kdump kernel: [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] To fix /proc/vmcore mmap memory below OLDMEMSIZE needs to be mapped with OLDMEM_BASE as offset. To achieve that, a new weak function arch_oldmem_remap_pfn_range() is introduced. If you agree with our approach, could you integrate the two patches into the mmap patch series? Best Regards, Michael --- Jan Willeke (2): kdump/mmap: Introduce arch_oldmem_remap_pfn_range() s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 arch/s390/kernel/crash_dump.c | 27 +++++++++++++++++++++++++++ fs/proc/vmcore.c | 15 ++++++++++++++- include/linux/crash_dump.h | 5 +++++ 3 files changed, 46 insertions(+), 1 deletion(-) -- 1.8.1.6 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from e06smtp18.uk.ibm.com ([195.75.94.114]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UfrjZ-000746-Kk for kexec@lists.infradead.org; Fri, 24 May 2013 13:08:38 +0000 Received: from /spool/local by e06smtp18.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 24 May 2013 14:03:41 +0100 Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id E237D17D8066 for ; Fri, 24 May 2013 14:09:22 +0100 (BST) Received: from d06av10.portsmouth.uk.ibm.com (d06av10.portsmouth.uk.ibm.com [9.149.37.251]) by b06cxnps4075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r4OD80d953870784 for ; Fri, 24 May 2013 13:08:00 GMT Received: from d06av10.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av10.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id r4OD8Ak3026421 for ; Fri, 24 May 2013 07:08:10 -0600 From: Michael Holzheu Subject: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Date: Fri, 24 May 2013 15:08:07 +0200 Message-Id: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: Vivek Goyal , HATAYAMA Daisuke Cc: Martin Schwidefsky , kexec@lists.infradead.org, Heiko Carstens , Jan Willeke , linux-kernel@vger.kernel.org Hello Vivek and Hatayama, Currently the /proc/vmcore mmap patches are not working on s390. The problem is that on s390 the kernel in not relocatable and therefore always runs in the lower memory area. Therefore for kdump on s390 we swap the lower memory area with the crashkernel area before starting the kdump kernel: [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] To fix /proc/vmcore mmap memory below OLDMEMSIZE needs to be mapped with OLDMEM_BASE as offset. To achieve that, a new weak function arch_oldmem_remap_pfn_range() is introduced. If you agree with our approach, could you integrate the two patches into the mmap patch series? Best Regards, Michael --- Jan Willeke (2): kdump/mmap: Introduce arch_oldmem_remap_pfn_range() s390/kdump/mmap: Implement arch_oldmem_remap_pfn_range() for s390 arch/s390/kernel/crash_dump.c | 27 +++++++++++++++++++++++++++ fs/proc/vmcore.c | 15 ++++++++++++++- include/linux/crash_dump.h | 5 +++++ 3 files changed, 46 insertions(+), 1 deletion(-) -- 1.8.1.6 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec