From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=F+sq=6U=vger.kernel.org=linux-kernel-owner@kernel.org>
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=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 AF997C28CBC
	for <linux-kernel@archiver.kernel.org>; Wed,  6 May 2020 12:07:12 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id 9A64B206DD
	for <linux-kernel@archiver.kernel.org>; Wed,  6 May 2020 12:07:12 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727932AbgEFMHI (ORCPT
        <rfc822;linux-kernel@archiver.kernel.org>);
        Wed, 6 May 2020 08:07:08 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55964 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL)
        by vger.kernel.org with ESMTP id S1727099AbgEFMHI (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 6 May 2020 08:07:08 -0400
Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20942C061A0F
        for <linux-kernel@vger.kernel.org>; Wed,  6 May 2020 05:07:08 -0700 (PDT)
Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de)
        by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256)
        (Exim 4.80)
        (envelope-from <tglx@linutronix.de>)
        id 1jWIoq-00029u-8m; Wed, 06 May 2020 14:06:32 +0200
Received: by nanos.tec.linutronix.de (Postfix, from userid 1000)
        id 7F6761001F5; Wed,  6 May 2020 14:06:31 +0200 (CEST)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Miroslav Benes <mbenes@suse.cz>
Cc:     LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Alexandre Chartre <alexandre.chartre@oracle.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Joel Fernandes <joel@joelfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        Brian Gerst <brgerst@gmail.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Will Deacon <will@kernel.org>,
        "Peter Zijlstra \(Intel\)" <peterz@infradead.org>
Subject: Re: [patch V4 part 1 05/36] x86/entry: Flip _TIF_SIGPENDING and _TIF_NOTIFY_RESUME handling
In-Reply-To: <alpine.LSU.2.21.2005061352050.20724@pobox.suse.cz>
Date:   Wed, 06 May 2020 14:06:31 +0200
Message-ID: <87k11pl12w.fsf@nanos.tec.linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain
X-Linutronix-Spam-Score: -1.0
X-Linutronix-Spam-Level: -
X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required,  ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Miroslav Benes <mbenes@suse.cz> writes:

> On Tue, 5 May 2020, Thomas Gleixner wrote:
>
>> Make sure task_work runs before any kind of userspace -- very much
>> including signals -- is invoked.
>
> I might be missing something, but isn't this guaranteed by 
> do_signal()->get_signal()->task_work_run() path?

The changelog is misleading. This is not about task_work it's about
TIF_NOTIFY_RESUME. Will fix.

Thanks,

        tglx