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=-5.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=unavailable 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 21AFAC4360F for ; Fri, 1 Mar 2019 11:46:23 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E55452083E for ; Fri, 1 Mar 2019 11:46:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ehme8FqW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E55452083E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Message-Id:In-Reply-To:MIME-Version: References:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=f6DbotCG5j1miYgw50FJYb6uQ5TLO2LqL4f2/tXH71w=; b=ehme8FqWtdkjFu q4ctzsujMdnn10DtB43yvD0gChPw+/rzElx5rSsx9jKZsRmtqPR0GkkLDArxtxWevE1jtYr7FEDmW 2ZyhZJK7hrZsQmgOwS7wY6SfXkjJXZelote0VfjBhAdOsRaSwQVXYpuISTz7lLJrQVehETyTHimwN Fp9r8IsGKxptufmeoGpu/yX/8i4vnw2V4isckI+1mPBRA8Oou7EN4pgLs9O2nsVsznzd39jD/1o4k 7nv/a4CuaHkcqfRYKpb5lFKb5OnEFE/d5DUdOj58RCRe8IRFco1SDI1w8+pjw25XiYgdKSJ5D8bTG x5vGH0/jvx0OpQAerKqQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzgcN-00012P-V2; Fri, 01 Mar 2019 11:46:19 +0000 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzgcK-00011x-3k for linux-arm-kernel@lists.infradead.org; Fri, 01 Mar 2019 11:46:18 +0000 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x21Bhwt5117181 for ; Fri, 1 Mar 2019 06:46:13 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2qy3mm9jhv-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 01 Mar 2019 06:46:13 -0500 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 1 Mar 2019 11:46:10 -0000 Received: from b06cxnps4074.portsmouth.uk.ibm.com (9.149.109.196) by e06smtp03.uk.ibm.com (192.168.101.133) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 1 Mar 2019 11:46:03 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x21Bk2Cb32505906 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 1 Mar 2019 11:46:02 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4E71CA404D; Fri, 1 Mar 2019 11:46:02 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B5AB8A4051; Fri, 1 Mar 2019 11:45:57 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.204.73]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Fri, 1 Mar 2019 11:45:57 +0000 (GMT) Date: Fri, 1 Mar 2019 13:45:54 +0200 From: Mike Rapoport To: Steven Price Subject: Re: [PATCH v3 09/34] m68k: mm: Add p?d_large() definitions References: <20190227170608.27963-1-steven.price@arm.com> <20190227170608.27963-10-steven.price@arm.com> <20190228113653.GB3766@rapoport-lnx> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19030111-0012-0000-0000-000002FBBE46 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19030111-0013-0000-0000-000021336E2C Message-Id: <20190301114553.GC5156@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-03-01_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1903010083 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190301_034616_265311_369CC2D5 X-CRM114-Status: GOOD ( 30.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Dave Hansen , James Morse , Arnd Bergmann , Ard Biesheuvel , Peter Zijlstra , Catalin Marinas , the arch/x86 maintainers , Will Deacon , Linux Kernel Mailing List , Linux MM , =?iso-8859-1?B?Suly9G1l?= Glisse , Ingo Molnar , Geert Uytterhoeven , Andy Lutomirski , "H. Peter Anvin" , Borislav Petkov , Thomas Gleixner , linux-m68k , Linux ARM , "Liang, Kan" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Feb 28, 2019 at 12:04:08PM +0000, Steven Price wrote: > On 28/02/2019 11:53, Geert Uytterhoeven wrote: > > Hi Mike, > > > > On Thu, Feb 28, 2019 at 12:37 PM Mike Rapoport wrote: > >> On Wed, Feb 27, 2019 at 08:27:40PM +0100, Geert Uytterhoeven wrote: > >>> On Wed, Feb 27, 2019 at 6:07 PM Steven Price wrote: > >>>> walk_page_range() is going to be allowed to walk page tables other than > >>>> those of user space. For this it needs to know when it has reached a > >>>> 'leaf' entry in the page tables. This information is provided by the > >>>> p?d_large() functions/macros. > >>>> > >>>> For m68k, we don't support large pages, so add stubs returning 0 > >>>> > >>>> CC: Geert Uytterhoeven > >>>> CC: linux-m68k@lists.linux-m68k.org > >>>> Signed-off-by: Steven Price > >>> > >>> Thanks for your patch! > >>> > >>>> arch/m68k/include/asm/mcf_pgtable.h | 2 ++ > >>>> arch/m68k/include/asm/motorola_pgtable.h | 2 ++ > >>>> arch/m68k/include/asm/pgtable_no.h | 1 + > >>>> arch/m68k/include/asm/sun3_pgtable.h | 2 ++ > >>>> 4 files changed, 7 insertions(+) > >>> > >> Maybe I'm missing something, but why the stubs have to be defined in > >> arch/*/include/asm/pgtable.h rather than in include/asm-generic/pgtable.h? > > > > That would even make more sense, given most architectures don't > > support huge pages. > > Where the architecture has folded a level stubs are provided by the > asm-generic layer, see this later patch: > > https://lore.kernel.org/lkml/20190227170608.27963-25-steven.price@arm.com/ > > However just because an architecture port doesn't (currently) support > huge pages doesn't mean that the architecture itself can't have large[1] > mappings at higher levels of the page table. For instance an > architecture might use large pages for the linear map but not support > huge page mappings for user space. Well, I doubt m68k can support large mappings at higher levels at all. This, IMHO, applies to many other architectures and spreading p?d_large all over those architecture seems wrong to me... > My previous posting of this series attempted to define generic versions > of p?d_large(), but it was pointed out to me that this was fragile and > having a way of knowing whether the page table was a 'leaf' is actually > useful, so I've attempted to implement for all architectures. See the > discussion here: > https://lore.kernel.org/lkml/20190221113502.54153-1-steven.price@arm.com/T/#mf0bd0155f185a19681b48a288be212ed1596e85d I'll reply on that thread, somehow I missed it then. > Steve > -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel