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 Content-Length: 1305 Lines: 38 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 -- 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/