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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B935C433EF for ; Tue, 15 Feb 2022 00:48:10 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9DE2E6B0078; Mon, 14 Feb 2022 19:48:09 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9B4F56B007B; Mon, 14 Feb 2022 19:48:09 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 87C826B007D; Mon, 14 Feb 2022 19:48:09 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.26]) by kanga.kvack.org (Postfix) with ESMTP id 798396B0078 for ; Mon, 14 Feb 2022 19:48:09 -0500 (EST) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay12.hostedemail.com (Postfix) with ESMTP id 3E83312063A for ; Tue, 15 Feb 2022 00:48:09 +0000 (UTC) X-FDA: 79143177498.01.6ED765C Received: from zeniv-ca.linux.org.uk (zeniv-ca.linux.org.uk [142.44.231.140]) by imf05.hostedemail.com (Postfix) with ESMTP id B07FA100003 for ; Tue, 15 Feb 2022 00:48:08 +0000 (UTC) Received: from viro by zeniv-ca.linux.org.uk with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJm0h-001pkI-9F; Tue, 15 Feb 2022 00:48:03 +0000 Date: Tue, 15 Feb 2022 00:48:03 +0000 From: Al Viro To: Arnd Bergmann Cc: Linus Torvalds , Christoph Hellwig , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org, bcain@codeaurora.org, geert@linux-m68k.org, monstr@monstr.eu, tsbogend@alpha.franken.de, nickhu@andestech.com, green.hu@gmail.com, dinguyen@kernel.org, shorne@gmail.com, deller@gmx.de, mpe@ellerman.id.au, peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com, hca@linux.ibm.com, dalias@libc.org, davem@davemloft.net, richard@nod.at, x86@kernel.org, jcmvbkbc@gmail.com, ebiederm@xmission.com, akpm@linux-foundation.org, ardb@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org Subject: Re: [PATCH 11/14] sparc64: remove CONFIG_SET_FS support Message-ID: References: <20220214163452.1568807-1-arnd@kernel.org> <20220214163452.1568807-12-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220214163452.1568807-12-arnd@kernel.org> Authentication-Results: imf05.hostedemail.com; dkim=none; spf=none (imf05.hostedemail.com: domain of viro@ftp.linux.org.uk has no SPF policy when checking 142.44.231.140) smtp.mailfrom=viro@ftp.linux.org.uk; dmarc=none X-Rspamd-Server: rspam07 X-Rspam-User: X-Rspamd-Queue-Id: B07FA100003 X-Stat-Signature: o3dkggrbmk8txa8mcxu13bgoxi4z1b9u X-HE-Tag: 1644886088-362476 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001617, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 14, 2022 at 05:34:49PM +0100, Arnd Bergmann wrote: > -/* > - * Sparc64 is segmented, though more like the M68K than the I386. > - * We use the secondary ASI to address user memory, which references a > - * completely different VM map, thus there is zero chance of the user > - * doing something queer and tricking us into poking kernel memory. Actually, this part of comment probably ought to stay - it is relevant for understanding what's going on (e.g. why is access_ok() always true, etc.)