From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id CA481C4167E
	for <linux-kernel@archiver.kernel.org>; Tue, 15 Feb 2022 06:29:53 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S234413AbiBOGaB (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Tue, 15 Feb 2022 01:30:01 -0500
Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:42462 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S232447AbiBOG36 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 15 Feb 2022 01:29:58 -0500
Received: from verein.lst.de (verein.lst.de [213.95.11.211])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC64B11E3E9;
        Mon, 14 Feb 2022 22:29:48 -0800 (PST)
Received: by verein.lst.de (Postfix, from userid 2407)
        id 11DDB68AA6; Tue, 15 Feb 2022 07:29:43 +0100 (CET)
Date:   Tue, 15 Feb 2022 07:29:42 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Al Viro <viro@zeniv.linux.org.uk>
Cc:     Arnd Bergmann <arnd@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>, 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 09/14] m68k: drop custom __access_ok()
Message-ID: <20220215062942.GA12551@lst.de>
References: <20220214163452.1568807-1-arnd@kernel.org> <20220214163452.1568807-10-arnd@kernel.org> <Ygr11RGjj3C9uAUg@zeniv-ca.linux.org.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Ygr11RGjj3C9uAUg@zeniv-ca.linux.org.uk>
User-Agent: Mutt/1.5.17 (2007-11-01)
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Feb 15, 2022 at 12:37:41AM +0000, Al Viro wrote:
> Perhaps simply wrap that sucker into #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
> (and trim the comment down to "coldfire and 68000 will pick generic
> variant")?

I wonder if we should invert CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE,
select the separate address space config for s390, sparc64, non-coldfire
m68k and mips with EVA and then just have one single access_ok for
overlapping address space (as added by Arnd) and non-overlapping ones
(always return true).