Received: by 2002:a25:23cc:0:0:0:0:0 with SMTP id j195csp927095ybj; Thu, 7 May 2020 10:40:34 -0700 (PDT) X-Google-Smtp-Source: APiQypKac/5ECWqXXcJbQ6kPxWPtA7ErqhSkSsBODqE4/ybFPMCO2Kmp0Ck5OnSN8iEFabs7HvB0 X-Received: by 2002:a05:6402:88a:: with SMTP id e10mr12838141edy.252.1588873234168; Thu, 07 May 2020 10:40:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1588873234; cv=none; d=google.com; s=arc-20160816; b=MC5HQTutiQEzlQ8C5fJKiDf2moS9fOS+xaPYRoQ3IGyclJbE6HuaBgH4klH9nc2Kpf K9LfQvKO7GpyLJC3G/upF5q7Sz/gsrOZWO/bQjNDsqFPadFytaWMh+R2JGGq8FworboI iY6BMWa2f8fzkDE4/gvi9B7bkFWSlzbCdSKlLrfjuQ23duIrFwpmulKmD2PsAvb0rqVG 66tNkMBeXQuMes/GAbbC33H2u6FsPzF8JC4+lVsH8oyz9Ytk++Dxzn207y3NU2HETeXb 65FCaVfYoG1D0G2CMCGIRSnHHop+2uhuUI2qG0pGl6UKzt5OJKpiMNY8FBJlhl80j8JA rMLw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:dkim-signature; bh=1wHE0TXO53b6BznsNjZOZjZWwvvUkAC4bTn6uu3rAzQ=; b=w8vDxKbSNZoK/2K3ml0Kh+0ahRBAs1WofJi3HUo/AH0kLhLOH2Fa95IqOaUT8W6z1s m8mEzY653sWPla4k09dKHtVpDd72vqZ66+Mhul3Oq7YaXsaS2yjz0r0txIczSPKEYtRy 4Q04y/8WTu+MI8fWnaQwnfrhJif1Lz6f/9ToAM1UDVBRPHc7Zrg+HH6Q0ZKAB+9BH8g+ OSe5+1+WjGnrxAew1K+j+QgnvSlg73HX3xB3wo592nTm8aLB/4SH5mcjmBKlqAxXXmD0 rjTgOeF8ZstjuStYTF+ku9yjdiylwMmnBS45Awf3Y5NbNFYyvdNiM/bcqB0PgC0N5tfp lYkQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oabPy4HQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id r10si3564783edy.321.2020.05.07.10.40.10; Thu, 07 May 2020 10:40:34 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oabPy4HQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728188AbgEGRfb (ORCPT + 99 others); Thu, 7 May 2020 13:35:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:34000 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726467AbgEGRfb (ORCPT ); Thu, 7 May 2020 13:35:31 -0400 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ABCB424962 for ; Thu, 7 May 2020 17:35:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588872930; bh=lncvbRIJtEWrXr/nx1Zzug/elFtPcJ+w7jc6HUXkj5M=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=oabPy4HQ0E14YCEFK66CDg1iM98007TazU78IqhjmFtCRowrd8sUrWD3sQpVvWYGi e+mjPEE9tODehrCSmCLHU6TVynWS7MeTtCDJ5Ok5i4OrN/aSyfyZJ+wBV34AmFhtXI 1QbvX4Rtax/aPPgTd4dlVDWq/1V7MyhL9ggkVf58= Received: by mail-wr1-f48.google.com with SMTP id h9so7408682wrt.0 for ; Thu, 07 May 2020 10:35:30 -0700 (PDT) X-Gm-Message-State: AGi0PuaPKYEndEgiejsaWxDMmhw7WouTeQplHWn0vhiDHzAnAaHSIJGN hcWMSGPzhroxh9YkHL1KeTdIZVM8VtkSYN5aBvVIDQ== X-Received: by 2002:adf:fe45:: with SMTP id m5mr3383432wrs.257.1588872928961; Thu, 07 May 2020 10:35:28 -0700 (PDT) MIME-Version: 1.0 References: <20200505131602.633487962@linutronix.de> <20200505134058.560059744@linutronix.de> In-Reply-To: <20200505134058.560059744@linutronix.de> From: Andy Lutomirski Date: Thu, 7 May 2020 10:35:17 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch V4 part 1 05/36] x86/entry: Flip _TIF_SIGPENDING and _TIF_NOTIFY_RESUME handling To: Thomas Gleixner Cc: LKML , X86 ML , "Paul E. McKenney" , Andy Lutomirski , Alexandre Chartre , Frederic Weisbecker , Paolo Bonzini , Sean Christopherson , Masami Hiramatsu , Petr Mladek , Steven Rostedt , Joel Fernandes , Boris Ostrovsky , Juergen Gross , Brian Gerst , Mathieu Desnoyers , Josh Poimboeuf , Will Deacon , "Peter Zijlstra (Intel)" 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 Tue, May 5, 2020 at 7:13 AM Thomas Gleixner wrote: > > Make sure task_work runs before any kind of userspace -- very much > including signals -- is invoked. I certainly approve of the change, but anything that fundamentally relies on this makes me uneasy. I'll keep an eye out for potential problems.