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[209.85.208.176]) by smtp.gmail.com with ESMTPSA id d27sm1822166lfn.149.2021.06.01.17.16.24 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Jun 2021 17:16:24 -0700 (PDT) Received: by mail-lj1-f176.google.com with SMTP id c11so291043ljd.6 for ; Tue, 01 Jun 2021 17:16:24 -0700 (PDT) X-Received: by 2002:a05:651c:1311:: with SMTP id u17mr22578068lja.48.1622592983882; Tue, 01 Jun 2021 17:16:23 -0700 (PDT) MIME-Version: 1.0 References: <1622589753-9206-1-git-send-email-mlin@kernel.org> <1622589753-9206-3-git-send-email-mlin@kernel.org> In-Reply-To: <1622589753-9206-3-git-send-email-mlin@kernel.org> From: Linus Torvalds Date: Tue, 1 Jun 2021 14:16:08 -1000 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 2/2] mm: adds NOSIGBUS extension for out-of-band shmem read To: Ming Lin Cc: Hugh Dickins , Simon Ser , Linux-MM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=KgV8JLk9; spf=pass (imf04.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.167.53 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org; dmarc=none X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 61E9E42F X-Stat-Signature: 4tymim4w7szbpkkst8uaunjxcxrdk8aj X-HE-Tag: 1622592981-748645 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: This series passes my "looks fine, is simple and straightforward" test. One nit: On Tue, Jun 1, 2021 at 1:22 PM Ming Lin wrote: > > + error = vm_insert_page(vma, (unsigned long)vmf->address, > + ZERO_PAGE(0)); On architectures where this matters - bad virtual caches - it would be better to use ZERO_PAGE(vmf->address). It doesn't make a difference on any sane architecture, but it's the RightThing(tm) to do. Linus