From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 861E3C433E6 for ; Fri, 19 Mar 2021 14:36:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4546C64F4D for ; Fri, 19 Mar 2021 14:36:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230081AbhCSOfv (ORCPT ); Fri, 19 Mar 2021 10:35:51 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53417 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230114AbhCSOfd (ORCPT ); Fri, 19 Mar 2021 10:35:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616164532; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=HR6BlhRi10R2YkmIR68UtbTv/7nJrwXj0GX0OuoUYEI=; b=MK/OWFPd4T5dssg/KcoCiXpfswOI51gi44eATGI2ZyVvz1rQ/T/g2E5n7BgUeev+Zhczw6 KxlCaLKRU+PtwsVjRudtEfWuQxUx3MjLBR/FZEVqsn3MSaDm9wy8Qi4FKorCWzNJhF7lcT Tj+lya80hX11RWCgyH9pB7gSpYsONBo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-501-sIMVJReaOfexJV6rX5Pawg-1; Fri, 19 Mar 2021 10:35:28 -0400 X-MC-Unique: sIMVJReaOfexJV6rX5Pawg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3368B100945E; Fri, 19 Mar 2021 14:35:24 +0000 (UTC) Received: from t480s.redhat.com (ovpn-112-11.ams2.redhat.com [10.36.112.11]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8CEE660C04; Fri, 19 Mar 2021 14:34:53 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , "Alexander A. Klimov" , Alexander Viro , Alexandre Belloni , Andrew Lunn , Andrew Morton , Andrey Zhizhikin , Arnd Bergmann , Benjamin Herrenschmidt , Brian Cain , Christian Borntraeger , Christophe Leroy , Chris Zankel , Corentin Labbe , "David S. Miller" , "Eric W. Biederman" , Geert Uytterhoeven , Gerald Schaefer , Greentime Hu , Greg Kroah-Hartman , Gregory Clement , Heiko Carstens , Helge Deller , Hillf Danton , huang ying , Ingo Molnar , Ivan Kokshaysky , "James E.J. Bottomley" , Jiaxun Yang , Jonas Bonn , Jonathan Corbet , Kairui Song , Krzysztof Kozlowski , Kuninori Morimoto , Linus Torvalds , Linux API , Liviu Dudau , Lorenzo Pieralisi , Luc Van Oostenryck , Luis Chamberlain , Matthew Wilcox , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Mike Rapoport , Mikulas Patocka , Minchan Kim , Niklas Schnelle , Oleksiy Avramchenko , Palmer Dabbelt , Paul Mackerras , "Pavel Machek (CIP)" , Pavel Machek , "Peter Zijlstra (Intel)" , Pierre Morel , Randy Dunlap , Richard Henderson , Rich Felker , Robert Richter , Rob Herring , Russell King , Sam Ravnborg , Sebastian Andrzej Siewior , Sebastian Hesselbarth , Stafford Horne , Stefan Kristiansson , Steven Rostedt , Sudeep Holla , Theodore Dubois , Thomas Bogendoerfer , Thomas Gleixner , Vasily Gorbik , Viresh Kumar , William Cohen , Xiaoming Ni , Yoshinori Sato Subject: [PATCH RFC 0/3] drivers/char: remove /dev/kmem for good Date: Fri, 19 Mar 2021 15:34:49 +0100 Message-Id: <20210319143452.25948-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org Let's start a discussion if /dev/kmem is worth keeping around and fixing/maintaining or if we should just remove it now for good. More details / findings in patch #1. Patch #2 and #3 perform minor cleanups based on removed /dev/kmem support. Only compile-tested on x86-64 -- good enough for discussing the general topic (RFC). David Hildenbrand (3): drivers/char: remove /dev/kmem for good mm: remove xlate_dev_kmem_ptr() mm/vmalloc: remove vwrite() Documentation/admin-guide/devices.txt | 2 +- arch/alpha/include/asm/io.h | 5 - arch/arm/configs/dove_defconfig | 1 - arch/arm/configs/magician_defconfig | 1 - arch/arm/configs/moxart_defconfig | 1 - arch/arm/configs/mps2_defconfig | 1 - arch/arm/configs/mvebu_v5_defconfig | 1 - arch/arm/configs/xcep_defconfig | 1 - arch/arm/include/asm/io.h | 5 - arch/h8300/configs/edosk2674_defconfig | 1 - arch/h8300/configs/h8300h-sim_defconfig | 1 - arch/h8300/configs/h8s-sim_defconfig | 1 - arch/hexagon/configs/comet_defconfig | 1 - arch/hexagon/include/asm/io.h | 1 - arch/ia64/include/asm/io.h | 1 - arch/ia64/include/asm/uaccess.h | 18 -- arch/m68k/configs/amcore_defconfig | 1 - arch/m68k/include/asm/io_mm.h | 5 - arch/mips/include/asm/io.h | 5 - arch/openrisc/configs/or1ksim_defconfig | 1 - arch/parisc/include/asm/io.h | 5 - arch/powerpc/include/asm/io.h | 5 - arch/s390/include/asm/io.h | 5 - arch/sh/configs/edosk7705_defconfig | 1 - arch/sh/configs/se7206_defconfig | 1 - arch/sh/configs/sh2007_defconfig | 1 - arch/sh/configs/sh7724_generic_defconfig | 1 - arch/sh/configs/sh7770_generic_defconfig | 1 - arch/sh/configs/sh7785lcr_32bit_defconfig | 1 - arch/sh/include/asm/io.h | 5 - arch/sparc/configs/sparc64_defconfig | 1 - arch/sparc/include/asm/io_64.h | 5 - arch/xtensa/configs/xip_kc705_defconfig | 1 - drivers/char/Kconfig | 10 - drivers/char/mem.c | 231 ---------------------- include/asm-generic/io.h | 11 -- include/linux/fs.h | 2 +- include/linux/vmalloc.h | 3 +- kernel/configs/android-base.config | 1 - mm/ksm.c | 2 +- mm/vmalloc.c | 113 +---------- 41 files changed, 5 insertions(+), 455 deletions(-) -- 2.29.2