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[209.85.208.175]) by smtp.gmail.com with ESMTPSA id h63-v6sm7623789lji.88.2018.11.22.09.35.54 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 22 Nov 2018 09:35:54 -0800 (PST) Received: by mail-lj1-f175.google.com with SMTP id k19-v6so8573324lji.11 for ; Thu, 22 Nov 2018 09:35:54 -0800 (PST) X-Received: by 2002:a2e:9819:: with SMTP id a25-v6mr8343445ljj.6.1542908153909; Thu, 22 Nov 2018 09:35:53 -0800 (PST) MIME-Version: 1.0 References: <02bfc577-32a5-66be-64bf-d476b7d447d2@kernel.dk> <20181121063609.GA109082@gmail.com> <48e27a3a-2bb2-ff41-3512-8aeb3fd59e57@kernel.dk> <1c22125bb5d22c2dcd686d0d3b390f115894f746.camel@redhat.com> <20181122103231.GA102790@gmail.com> In-Reply-To: From: Linus Torvalds Date: Thu, 22 Nov 2018 09:35:37 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] x86: only use ERMS for user copies for larger sizes To: Andrew Lutomirski Cc: Ingo Molnar , pabeni@redhat.com, Jens Axboe , Thomas Gleixner , Ingo Molnar , bp@alien8.de, Peter Anvin , "the arch/x86 maintainers" , Andrew Morton , Peter Zijlstra , dvlasenk@redhat.com, brgerst@gmail.com, Linux List Kernel Mailing Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 22, 2018 at 9:26 AM Andy Lutomirski wrote: > > So I think your patch is viable. Also, with that patch applied, > put_user_ex() should become worse than worthless Yes. I hate those special-case _ex variants. I guess I should just properly forward-port my patch series where the different steps are separated out (not jumbled up like that patch I actually posted). Linus