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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 4AE1BC004C9 for ; Sun, 5 May 2019 06:21:35 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 CD3122082F for ; Sun, 5 May 2019 06:21:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD3122082F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 44xbNr5j97zDqP4 for ; Sun, 5 May 2019 16:21:32 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=rppt@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 44xbMM4LnzzDq7w for ; Sun, 5 May 2019 16:20:15 +1000 (AEST) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4566NUB014246 for ; Sun, 5 May 2019 02:20:13 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2s9r8bksv3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sun, 05 May 2019 02:20:13 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 5 May 2019 07:20:10 +0100 Received: from b06cxnps4076.portsmouth.uk.ibm.com (9.149.109.198) by e06smtp01.uk.ibm.com (192.168.101.131) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Sun, 5 May 2019 07:20:02 +0100 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x456K1TN53477458 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 5 May 2019 06:20:01 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 12B4411C04C; Sun, 5 May 2019 06:20:01 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CC1BF11C04A; Sun, 5 May 2019 06:19:58 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.8.112]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Sun, 5 May 2019 06:19:58 +0000 (GMT) Date: Sun, 5 May 2019 09:19:57 +0300 From: Mike Rapoport To: Mark Rutland Subject: Re: [PATCH 04/15] arm64: switch to generic version of pte allocation References: <1556810922-20248-1-git-send-email-rppt@linux.ibm.com> <1556810922-20248-5-git-send-email-rppt@linux.ibm.com> <20190503100508.GB47811@lakrids.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190503100508.GB47811@lakrids.cambridge.arm.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19050506-4275-0000-0000-0000033186BE X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19050506-4276-0000-0000-00003840EB99 Message-Id: <20190505061956.GE15755@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-05_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 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-1905050056 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Catalin Marinas , Palmer Dabbelt , linux-mips@vger.kernel.org, Guo Ren , linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, Helge Deller , x86@kernel.org, Russell King , Matthew Wilcox , Geert Uytterhoeven , Matt Turner , Sam Creasey , Arnd Bergmann , linux-um@lists.infradead.org, Richard Weinberger , linux-m68k@lists.linux-m68k.org, Greentime Hu , nios2-dev@lists.rocketboards.org, Guan Xuetao , linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Kuo , Paul Burton , linux-alpha@vger.kernel.org, Ley Foon Tan , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, May 03, 2019 at 11:05:09AM +0100, Mark Rutland wrote: > Hi, > > On Thu, May 02, 2019 at 06:28:31PM +0300, Mike Rapoport wrote: > > The PTE allocations in arm64 are identical to the generic ones modulo the > > GFP flags. > > > > Using the generic pte_alloc_one() functions ensures that the user page > > tables are allocated with __GFP_ACCOUNT set. > > > > The arm64 definition of PGALLOC_GFP is removed and replaced with > > GFP_PGTABLE_USER for p[gum]d_alloc_one() and for KVM memory cache. > > > > The mappings created with create_pgd_mapping() are now using > > GFP_PGTABLE_KERNEL. > > > > The conversion to the generic version of pte_free_kernel() removes the NULL > > check for pte. > > > > The pte_free() version on arm64 is identical to the generic one and > > can be simply dropped. > > > > Signed-off-by: Mike Rapoport > > --- > > arch/arm64/include/asm/pgalloc.h | 43 ++++------------------------------------ > > arch/arm64/mm/mmu.c | 2 +- > > arch/arm64/mm/pgd.c | 4 ++-- > > virt/kvm/arm/mmu.c | 2 +- > > 4 files changed, 8 insertions(+), 43 deletions(-) > > [...] > > > diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c > > index 289f911..2ef1a53 100644 > > --- a/arch/arm64/mm/pgd.c > > +++ b/arch/arm64/mm/pgd.c > > @@ -31,9 +31,9 @@ static struct kmem_cache *pgd_cache __ro_after_init; > > pgd_t *pgd_alloc(struct mm_struct *mm) > > { > > if (PGD_SIZE == PAGE_SIZE) > > - return (pgd_t *)__get_free_page(PGALLOC_GFP); > > + return (pgd_t *)__get_free_page(GFP_PGTABLE_USER); > > else > > - return kmem_cache_alloc(pgd_cache, PGALLOC_GFP); > > + return kmem_cache_alloc(pgd_cache, GFP_PGTABLE_USER); > > } > > In efi_virtmap_init() we use pgd_alloc() to allocate a pgd for EFI > runtime services, which we map with a special kernel page table. > > I'm not sure if accounting that is problematic, as it's allocated in a > kernel thread off the back of an early_initcall. The accounting bypasses kernel threads so there should be no problem. > Just to check, Is that sound, or do we need a pgd_alloc_kernel()? > > Thanks, > Mark. > -- Sincerely yours, Mike.