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[91.12.105.206]) by smtp.gmail.com with ESMTPSA id l18sm3315252wrt.97.2021.06.01.08.00.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Jun 2021 08:00:24 -0700 (PDT) Subject: Re: [QUESTION] arm64: mmap to the hugetlbfs with hugepagesize=512M got SIGILL To: Yongqiang Liu , catalin.marinas@arm.com, will.deacon@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, wangkefeng.wang@huawei.com References: From: David Hildenbrand Organization: Red Hat Message-ID: Date: Tue, 1 Jun 2021 17:00:24 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-Rspamd-Queue-Id: AE0879001E76 Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="YLRE/YML"; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf19.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=david@redhat.com X-Rspamd-Server: rspam03 X-Stat-Signature: g35eyitbiab4787bsmgtpt6xkwjtzmwr X-HE-Tag: 1622559614-502073 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 01.06.21 11:34, Yongqiang Liu wrote: > Hi Catalin and Will, >=20 > when we mmap the addr NULL with MAP_FIXED flag to the hugetlbfs, system > will return NULL successfully. >=20 > 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 ? H= ere > is my test steps: >=20 > =C2=A0=C2=A0=C2=A0 1. echo 10 > /sys/kernel/mm/hugepages/hugepages-20= 48kB/nr_hugepages >=20 > =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 echo 10 > /sys/kernel/mm/hugepa= ges/hugepages-524288kB/nr_hugepages Which values do you get when you read back these knobs? --=20 Thanks, David / dhildenb