From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pa0-f46.google.com ([209.85.220.46]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UgUUz-0001Rf-Pr for kexec@lists.infradead.org; Sun, 26 May 2013 06:32:10 +0000 Received: by mail-pa0-f46.google.com with SMTP id fa10so5762413pad.33 for ; Sat, 25 May 2013 23:31:47 -0700 (PDT) Message-ID: <51A1AC4A.60506@gmail.com> Date: Sun, 26 May 2013 14:31:38 +0800 From: Zhang Yanfei MIME-Version: 1.0 Subject: [PATCH v2 0/7] Remove unused /dev/oldmem interface List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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: "Eric W. Biederman" , Vivek Goyal , Andrew Morton , "H. Peter Anvin" , Simon Horman Cc: "kexec@lists.infradead.org" , "linux-kernel@vger.kernel.org" /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. -v2: Keep /dev/oldmem and its number 12 in case this number will get reused in the future. And mark it obsolete since /dev/oldmem will be removed from kernel. Zhang Yanfei (7): /dev/oldmem: Remove this interface Documentation/devices.txt: Mark /dev/oldmem obsolete 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 | 3 +- 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, 7 insertions(+), 103 deletions(-) _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec