Received: by 2002:a05:6a10:6744:0:0:0:0 with SMTP id w4csp448538pxu; Thu, 15 Oct 2020 07:59:38 -0700 (PDT) X-Google-Smtp-Source: ABdhPJybTlDt1NttfHgBUjJuqPRrGYlQxizslKzlWTsCAu3vZCe8E6rbvTQ3rdZ7aK7gFFy19Krq X-Received: by 2002:a17:906:3a8c:: with SMTP id y12mr4604085ejd.531.1602773978363; Thu, 15 Oct 2020 07:59:38 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1602773978; cv=none; d=google.com; s=arc-20160816; b=GRFbU6QEUrifqFlgoLaT8BtXdoyLV5s0H3t+fnol4MKZTL1AFvr7QpVPI4ICoCLJYM WphvQuhBNelraNzEVbmp+iVlvhwvmCqa8mW+u1zzhHp8VtkOyIo7o28WSllM1qg6z3pX xdRy6c4PwWEl5QE/Kzz0wcWikiakPgzAKC3curUbiGzJG0MYDZPRJZQOJS5/4L5OEhYv dmJaAs8VhB7neCX092Q925dKQ5yqdpJ6zbnp53JXhTv2cOwGyTOKQ+0HkPANvdqKik9G johK5GqrskjvTwTEQrbLziMloIiEU3VuH+KQignYb3qSjFWZj3PXuqncHWcOUydlqONY X+2g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:user-agent:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :dkim-signature; bh=z4+pIlbp7Cy6qMJUZsGdnt36WSG6eee++gYbihv/3Cg=; b=qZPfIidA1MXsUAutsd6az86CIFV48ciAIOzVKYEmx0ZY7ulykmEE8kxzJO4WJzuTzK KN4lrYmu+6Bl9mYTa+G6PhEY0P1DjKvgNfkaZEqxFBXITkZF7LzWZ5rHb8UaCtx/sWW4 LH6P4gkWa7NJHevGFXoS5PHyGNpIWmXoO7OmICQPjb6Y93sSMpN9+hCOO+BdyU64t/np bWx3k6ii8TFi1TnWLxROkeduHGlAfwSPfFilPezbPCR5Mnw9Z7EfnX8DYzO/BNJLsQgc rfR/Ru6I5Pzg3WPfu9cG7x2rLlHohlswYWJ/7BYBEuq6TC3o+90VPByBETGWD/fH5oFo EprA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=K96VHEcb; 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=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g26si2225739ejb.734.2020.10.15.07.59.06; Thu, 15 Oct 2020 07:59:38 -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=@redhat.com header.s=mimecast20190719 header.b=K96VHEcb; 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=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389273AbgJOOyH (ORCPT + 99 others); Thu, 15 Oct 2020 10:54:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53778 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388348AbgJOOyG (ORCPT ); Thu, 15 Oct 2020 10:54:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602773645; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=z4+pIlbp7Cy6qMJUZsGdnt36WSG6eee++gYbihv/3Cg=; b=K96VHEcbqkSVkjMeX6SzZr4JBKAC6MDslKaLduSN9dBNaaJiYusDSxCEtd6ldh+27M/C5V 9YdeeLaq87wwwgPHwitz/64w25EsKCQx0gvRUFQVV+vKx+KCCqw2bg179HOzcU2mHXT4wJ oJKkA/Dyhg4Xls/qUWCDBLUa3KNc3pU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-523-RzgRUKdEPCyLDDr0nlz12A-1; Thu, 15 Oct 2020 10:54:03 -0400 X-MC-Unique: RzgRUKdEPCyLDDr0nlz12A-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 55FAA18A822A; Thu, 15 Oct 2020 14:54:02 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.40.193.8]) by smtp.corp.redhat.com (Postfix) with SMTP id DAC535C1BD; Thu, 15 Oct 2020 14:54:00 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Thu, 15 Oct 2020 16:54:02 +0200 (CEST) Date: Thu, 15 Oct 2020 16:53:59 +0200 From: Oleg Nesterov To: Jens Axboe Cc: linux-kernel@vger.kernel.org, io-uring@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de Subject: Re: [PATCH 3/5] kernel: add support for TIF_NOTIFY_SIGNAL Message-ID: <20201015145359.GA14671@redhat.com> References: <20201015131701.511523-1-axboe@kernel.dk> <20201015131701.511523-4-axboe@kernel.dk> <20201015143151.GB24156@redhat.com> <5d231aa1-b8c7-ae4e-90bb-211f82b57547@kernel.dk> <20201015143728.GE24156@redhat.com> <788b31b7-6acc-cc85-5e91-d0c2538341b7@kernel.dk> <20201015144713.GJ24156@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201015144713.GJ24156@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/15, Oleg Nesterov wrote: > > On 10/15, Jens Axboe wrote: > > > > That is indeed a worry. From a functionality point of view, with the > > major archs supporting it, I'm not too worried about that side. But it > > does mean that we'll be stuck with the ifdeffery forever, which isn't > > great. > > plus we can't kill the ugly JOBCTL_TASK_WORK. not to mention we can not change freezer/livepatch to use NOTIFY_SIGNAL, or add new users of set_notify_signal(). Oleg.