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[91.12.99.146]) by smtp.gmail.com with ESMTPSA id p17sm1659280wmq.47.2021.04.15.02.30.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Apr 2021 02:30:12 -0700 (PDT) Subject: Re: [RFC/RFT PATCH 1/3] memblock: update initialization of reserved pages To: Mike Rapoport Cc: Ard Biesheuvel , Linux ARM , Anshuman Khandual , Catalin Marinas , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , kvmarm , Linux Kernel Mailing List , Linux Memory Management List References: <20210407172607.8812-1-rppt@kernel.org> <20210407172607.8812-2-rppt@kernel.org> <0c48f98c-7454-1458-15a5-cc5a7e1fb7cd@redhat.com> <3811547a-9057-3c80-3805-2e658488ac99@redhat.com> From: David Hildenbrand Organization: Red Hat Message-ID: Date: Thu, 15 Apr 2021 11:30:12 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B6C74E8 X-Stat-Signature: qpq8em1ezgheexu9mcejnzfsw7i7pcjp Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618479011-250463 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: > Not sure we really need a new pagetype here, PG_Reserved seems to be quite > enough to say "don't touch this". I generally agree that we could make > PG_Reserved a PageType and then have several sub-types for reserved memory. > This definitely will add clarity but I'm not sure that this justifies > amount of churn and effort required to audit uses of PageResrved(). > >> Then, we could mostly avoid having to query memblock at runtime to figure >> out that this is special memory. This would obviously be an extension to >> this series. Just a thought. > > Stop pushing memblock out of kernel! ;-) Can't stop. Won't stop. :D It's lovely for booting up a kernel until we have other data-structures in place ;) -- Thanks, David / dhildenb