From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F17CC6786F for ; Thu, 1 Nov 2018 15:33:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5B3172081B for ; Thu, 1 Nov 2018 15:33:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="MrVqwu3K" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B3172081B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728843AbeKBAhW (ORCPT ); Thu, 1 Nov 2018 20:37:22 -0400 Received: from mail-lf1-f67.google.com ([209.85.167.67]:35295 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727996AbeKBAhV (ORCPT ); Thu, 1 Nov 2018 20:37:21 -0400 Received: by mail-lf1-f67.google.com with SMTP id d7-v6so14502790lfi.2 for ; Thu, 01 Nov 2018 08:33:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=egKIjUBO7rTC1Nw+Ekbq2UHQPHX01tyVGykEgaGfB4s=; b=MrVqwu3Kc87dpUvdaDLIQTp88fAAekaljK2k2yhDdkH19sDNRC9COQXL7HdeSbmKPQ btGFbvU+sSQ6ts9iPHU4XbKb2KpCkGYR0RH25f0ZJMP+cUvUHgtvRSH0QtS8PZ5DvbnO 5DQ/zRfvYW13ktNghb35agLIlElLTZekxy4sw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=egKIjUBO7rTC1Nw+Ekbq2UHQPHX01tyVGykEgaGfB4s=; b=EgSE5KSXcCAOxMc6DIfNcAK5aKZtCGo8iRAbIaOl0TmNqZ0aid8vxBWLxcHUE3lBQG aOSgw+NinFAr/LInQHNd5GnTRPCDZtw0ToJk98WPzGqIHztmUdfF4F1TuBxAkjTRUnWE K4sULJQRciYOoTQb2tpJ0P5m4LJwHh0JputjsTp9YmZ1UB1nTh3WyTDVX8ym8AXpecE6 DIzycOVONe5lIbWKUoxGGFdC6LtXd0zYWWTlHUlVLzmu8os31fC1BZ26xUWzXQ2m0bfc chjxQZPRunFzG8AEx3spEt+uKSCwDNcQabQOvDWj0RGrM4VaEEXfvKnxX0z+PZgb8ayl zGOQ== X-Gm-Message-State: AGRZ1gKjGi9kku5YOQWQ54Y/kB9p5+rzeKenvL7G0PwSwBBPiK2pOrsi kcMSv2lOwOGJR6rJQCj8L1jwHcvZBuA= X-Google-Smtp-Source: AJdET5dj+4AOqLFd6X37fbp85M6MI//MsjlWpuczDyOpiUJnmj5lGVOhdT0P6wmpgx36+dzJy1vB7A== X-Received: by 2002:a19:4287:: with SMTP id p129mr4930790lfa.135.1541086432975; Thu, 01 Nov 2018 08:33:52 -0700 (PDT) Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com. [209.85.167.49]) by smtp.gmail.com with ESMTPSA id r199sm2092082lff.50.2018.11.01.08.33.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 01 Nov 2018 08:33:52 -0700 (PDT) Received: by mail-lf1-f49.google.com with SMTP id p17so8039261lfh.4 for ; Thu, 01 Nov 2018 08:33:52 -0700 (PDT) X-Received: by 2002:ac2:41d8:: with SMTP id d24-v6mr4493834lfi.138.1541086431420; Thu, 01 Nov 2018 08:33:51 -0700 (PDT) MIME-Version: 1.0 References: <20181101095844.24462-1-mathieu.desnoyers@efficios.com> In-Reply-To: <20181101095844.24462-1-mathieu.desnoyers@efficios.com> From: Linus Torvalds Date: Thu, 1 Nov 2018 08:33:35 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH for 4.21 00/16] rseq updates, new cpu_opv system call (v2) To: Mathieu Desnoyers Cc: Peter Zijlstra , Paul McKenney , boqun.feng@gmail.com, Linux Kernel Mailing List , linux-api@vger.kernel.org, tglx@linutronix.de, luto@amacapital.net, davejwatson@fb.com, pjt@google.com, Andrew Morton , linux@arm.linux.org.uk, Ingo Molnar , Peter Anvin , andi@firstfloor.org, Christoph Lameter , bmaurer@fb.com, rostedt@goodmis.org, josh@joshtriplett.org, Catalin Marinas , will.deacon@arm.com, mtk.manpages@gmail.com, joelaf@google.com 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 1, 2018 at 2:59 AM Mathieu Desnoyers wrote: > > Here is an updated patchset submitted as RFC for 4.21 (next merge > window). So I'm not willing to take the cpu_opv system call until I see the the regular rseq code getting more real-life use. Maybe people are using it. Maybe they aren't. I want to hold off and wait until we _know_ it's getting used, and not just in test libraries. Linus