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[209.85.208.171]) by smtp.gmail.com with ESMTPSA id z3-20020a19e203000000b004720efecabesm811539lfg.21.2022.04.27.09.00.52 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Apr 2022 09:00:52 -0700 (PDT) Received: by mail-lj1-f171.google.com with SMTP id v1so3265060ljv.3 for ; Wed, 27 Apr 2022 09:00:52 -0700 (PDT) X-Received: by 2002:a2e:934b:0:b0:24f:cce:5501 with SMTP id m11-20020a2e934b000000b0024f0cce5501mr12651353ljh.443.1651075251987; Wed, 27 Apr 2022 09:00:51 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Wed, 27 Apr 2022 09:00:35 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 02/14] tmpfs: fix regressions from wider use of ZERO_PAGE To: Borislav Petkov Cc: Mark Hemment , Andrew Morton , "the arch/x86 maintainers" , Peter Zijlstra , patrice.chotard@foss.st.com, Mikulas Patocka , Lukas Czerner , Christoph Hellwig , "Darrick J. Wong" , Chuck Lever , Hugh Dickins , patches@lists.linux.dev, Linux-MM , mm-commits@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 65C6E40047 X-Stat-Signature: p67hdyjo1pb8moi48ude33fytcttukcq Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=Jlr52u75; spf=pass (imf27.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.167.52 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org X-HE-Tag: 1651075254-384700 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 Wed, Apr 27, 2022 at 3:41 AM Borislav Petkov wrote: > > Any particular reason for the explicit "q" suffix? The register already > denotes the opsize and the generated opcode is the same. No, I just added the 'q' prefix to distinguish it from the 'l' instruction working on the same register one line earlier. And then I wasn't consistent throughout, because it was really just about me thinking about that "here we can use 32-bit ops, and here we are working with the full possible 64-bit range". So take that code as what it is - an untested and slightly edited version of the code you sent me, meant for "how about like this" purposes rather than anything else. Linus