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Thu, 25 Feb 2021 10:34:14 +0000 (UTC) Subject: Re: [PATCH 2/3] Documentation: riscv: Add documentation that describes the VM layout To: Alexandre Ghiti , Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Arnd Bergmann , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-mm@kvack.org References: <20210225080453.1314-1-alex@ghiti.fr> <20210225080453.1314-3-alex@ghiti.fr> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <5279e97c-3841-717c-2a16-c249a61573f9@redhat.com> Date: Thu, 25 Feb 2021 11:34:13 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210225080453.1314-3-alex@ghiti.fr> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0B48CA0009D3 X-Stat-Signature: e9p7zzrzhm1wkohkn3wnt3xgocx88i4f Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf23; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=63.128.21.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614249263-33649 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: | | | |> + ffffffc000000000 | -256 GB | ffffffc7ffffffff | 32 GB | kasan > + ffffffcefee00000 | -196 GB | ffffffcefeffffff | 2 MB | fixmap > + ffffffceff000000 | -196 GB | ffffffceffffffff | 16 MB | PCI io > + ffffffcf00000000 | -196 GB | ffffffcfffffffff | 4 GB | vmemmap > + ffffffd000000000 | -192 GB | ffffffdfffffffff | 64 GB | vmalloc/ioremap space > + ffffffe000000000 | -128 GB | ffffffff7fffffff | 126 GB | direct mapping of all physical memory ^ So you could never ever have more than 126 GB, correct? I assume that's nothing new. -- Thanks, David / dhildenb