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=-5.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 0E8DAC4708F for ; Wed, 2 Jun 2021 01:34:03 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 82BA8613CD for ; Wed, 2 Jun 2021 01:34:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82BA8613CD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E6F5F6B0070; Tue, 1 Jun 2021 21:34:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E20556B0071; Tue, 1 Jun 2021 21:34:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CC0B76B0072; Tue, 1 Jun 2021 21:34:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0232.hostedemail.com [216.40.44.232]) by kanga.kvack.org (Postfix) with ESMTP id 9657D6B0070 for ; Tue, 1 Jun 2021 21:34:00 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 32BF9181AC9CB for ; Wed, 2 Jun 2021 01:34:00 +0000 (UTC) X-FDA: 78207062640.08.46AAE61 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by imf13.hostedemail.com (Postfix) with ESMTP id B484BE000258 for ; Wed, 2 Jun 2021 01:33:46 +0000 (UTC) Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4Fvs0M1yjTz67kP; Wed, 2 Jun 2021 09:30:11 +0800 (CST) Received: from dggpeml500005.china.huawei.com (7.185.36.59) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Wed, 2 Jun 2021 09:33:55 +0800 Received: from [10.174.178.155] (10.174.178.155) by dggpeml500005.china.huawei.com (7.185.36.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2176.2; Wed, 2 Jun 2021 09:33:54 +0800 Subject: Re: [QUESTION] arm64: mmap to the hugetlbfs with hugepagesize=512M got SIGILL To: David Hildenbrand , , CC: , , References: From: Yongqiang Liu Message-ID: Date: Wed, 2 Jun 2021 09:33:54 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed X-Originating-IP: [10.174.178.155] X-ClientProxiedBy: dggeme710-chm.china.huawei.com (10.1.199.106) To dggpeml500005.china.huawei.com (7.185.36.59) X-CFilter-Loop: Reflected Authentication-Results: imf13.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=huawei.com; spf=pass (imf13.hostedemail.com: domain of liuyongqiang13@huawei.com designates 45.249.212.189 as permitted sender) smtp.mailfrom=liuyongqiang13@huawei.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B484BE000258 X-Stat-Signature: ua34ybs3dm8nusy647mq35uw4zg7rxqo X-HE-Tag: 1622597626-197897 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: =E5=9C=A8 2021/6/1 23:00, David Hildenbrand =E5=86=99=E9=81=93: > On 01.06.21 11:34, Yongqiang Liu wrote: >> Hi Catalin and Will, >> >> when we mmap the addr NULL with MAP_FIXED flag to the hugetlbfs, syste= m >> will return NULL successfully. >> >> My question is: Why mmap to file with the hugepagesize=3D512M=C2=A0 we= got >> SIGILL but mmap to the file with hugepagesize=3D2M we got a success ? = Here >> is my test steps: >> >> =C2=A0 =C2=A0=C2=A0=C2=A0 1. echo 10 >=20 >> /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages >> >> =C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 echo 10 >=20 >> /sys/kernel/mm/hugepages/hugepages-524288kB/nr_hugepages > > Which values do you get when you read back these knobs? > > 10. I forgot that the selinux should be disabled or mmap return failed=20 > with error code 13. Thanks, Yongqiang Liu