Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756072Ab3EYDWJ (ORCPT ); Fri, 24 May 2013 23:22:09 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:50787 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753612Ab3EYDWI (ORCPT ); Fri, 24 May 2013 23:22:08 -0400 Message-ID: <51A02E50.5020507@gmail.com> Date: Sat, 25 May 2013 11:21:52 +0800 From: Zhang Yanfei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.5) Gecko/20120607 Thunderbird/10.0.5 MIME-Version: 1.0 To: "Eric W. Biederman" , Vivek Goyal , Andrew Morton , "H. Peter Anvin" , Simon Horman CC: "kexec@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH 0/7] Remove unused /dev/oldmem interface Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1827 Lines: 38 /dev/oldmem provides the interface for us to access the "old memory" in the dump-capture kernel. Unfortunately, no one actually uses this interface. And this interface could actually cause some real problems if used on ia64 where the cached/uncached accesses are mixed. See the discussion from the link: https://lkml.org/lkml/2013/4/12/386. So Eric suggested that we should remove /dev/oldmem as an unused piece of code. Besides, we used a global variable saved_max_pfn to let the capture kernel know the amount of memory that the previous kernel used. And for almost all architectures (except x86. In x86, saved_max_pfn is used by detect_calgary()), the only user of this variable is the read_oldmem interface of /dev/oldmem, so also remove the setting for saved_max_pfn in those architectures. Zhang Yanfei (7): /dev/oldmem: Remove this interface Documentation/devices.txt: Remove /dev/oldmem description Documentation/kdump/kdump.txt: Remove /dev/oldmem description mips: Remove savemaxmem parameter setup powerpc: Remove savemaxmem parameter setup ia64: Remove setting for saved_max_pfn s390: Remove setting for saved_max_pfn Documentation/devices.txt | 2 - Documentation/kdump/kdump.txt | 31 +++++-------------------- arch/ia64/kernel/efi.c | 5 ---- arch/mips/kernel/crash_dump.c | 10 -------- arch/powerpc/kernel/crash_dump.c | 10 -------- arch/s390/kernel/setup.c | 4 --- drivers/char/mem.c | 47 -------------------------------------- 7 files changed, 6 insertions(+), 103 deletions(-) -- 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/