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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 030E1C432BE for ; Mon, 30 Aug 2021 22:12:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA40D60FD9 for ; Mon, 30 Aug 2021 22:12:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238797AbhH3WNN (ORCPT ); Mon, 30 Aug 2021 18:13:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238480AbhH3WNM (ORCPT ); Mon, 30 Aug 2021 18:13:12 -0400 Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3637C061575 for ; Mon, 30 Aug 2021 15:12:17 -0700 (PDT) Received: by mail-lj1-x22c.google.com with SMTP id w4so28379765ljh.13 for ; Mon, 30 Aug 2021 15:12:17 -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=K/wJoxG+i27oKrP3cLakziJxV0qVvhUy/gmxpm7mduk=; b=MAt9ZAiyMAMatDdPJvAfiKfJJXabP2nn30Sq/tL3gFwRDEMkaw/Ao71akLjCtsx/de fkZENWkXI4qiIv/TVIrKCgurVEQaY9eGRALaN+kPCUUXgK1tqxqCQWkLhK7QObP6eGME sgONDssS2VOy6f32TGrqfUxG0cUNOal0g4Xcs= 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=K/wJoxG+i27oKrP3cLakziJxV0qVvhUy/gmxpm7mduk=; b=GBSJhFOap3E4H8uVADLIArp9PqtiC1M4vLxZpVfaTayqMOekauu75BRrrJURXN6Yzj vcZRxg1dDSMh+aIQ6SVhxzFm4j1sWSRnGU0gNRa4FsR6O/dA3RTWuTLRWOlM6ev+9OiR jFHq/gexYEe4orbxAUOcbtrnv4v8d0OyJ+EmW7mASDoc0cj1V4s5blRAzxo4Lr6B4ghZ BwCwXX+BGGTp0GtIchRsfpUXDzSvkDBAiYlBY6wDRKXy2BypvMkxnyLo7CCylYGpvSlJ d4j0Bvr5F3GiKPrrKXkqrc+BbEL7INIP45mv+8gkPxwS4q5sXuNYLtlO9PEaZDZA6t9G q7QQ== X-Gm-Message-State: AOAM533GotnThy6/w5RVvvmtHVFjA21W4c/EJ7UEzh+Fdmf57ym4IL/C IPYL05MVHJVbl8kGhXcU7b4/D870Sxg7bJNMirM= X-Google-Smtp-Source: ABdhPJzwuvPpJClwtUg+3EVrIa08hexpNvsztA9Dts11Afq8ectND4l0vwbD271xDsL3gc89UuzbJQ== X-Received: by 2002:a05:651c:1121:: with SMTP id e1mr22020349ljo.468.1630361535910; Mon, 30 Aug 2021 15:12:15 -0700 (PDT) Received: from mail-lj1-f182.google.com (mail-lj1-f182.google.com. [209.85.208.182]) by smtp.gmail.com with ESMTPSA id bt42sm1516093lfb.118.2021.08.30.15.12.15 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 15:12:15 -0700 (PDT) Received: by mail-lj1-f182.google.com with SMTP id q21so28381535ljj.6 for ; Mon, 30 Aug 2021 15:12:15 -0700 (PDT) X-Received: by 2002:a2e:84c7:: with SMTP id q7mr21908833ljh.61.1630361535140; Mon, 30 Aug 2021 15:12:15 -0700 (PDT) MIME-Version: 1.0 References: <20210830154702.247681585@linutronix.de> <20210830162545.374070793@linutronix.de> <87zgsyg0eg.ffs@tglx> <87r1eafv7k.ffs@tglx> In-Reply-To: <87r1eafv7k.ffs@tglx> From: Linus Torvalds Date: Mon, 30 Aug 2021 15:11:59 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 01/10] x86/fpu/signal: Clarify exception handling in restore_fpregs_from_user() To: Thomas Gleixner Cc: Al Viro , Dan Williams , Borislav Petkov , LKML , "the arch/x86 maintainers" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 30, 2021 at 3:01 PM Thomas Gleixner wrote: > > So yes, the negation does not matter, but the ability to check whether > the fail was caused by #PF or not matters. See my secopd email with a note on access granularity, and why this kind of model doesn't seem to work in general and seems dangerous. Linus