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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 A214FC43461 for ; Wed, 5 May 2021 23:16:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7902B613ED for ; Wed, 5 May 2021 23:16:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230460AbhEEXRT (ORCPT ); Wed, 5 May 2021 19:17:19 -0400 Received: from smtp.polymtl.ca ([132.207.4.11]:46291 "EHLO smtp.polymtl.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229465AbhEEXRS (ORCPT ); Wed, 5 May 2021 19:17:18 -0400 Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id 145NFuAZ013297 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 5 May 2021 19:16:00 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp.polymtl.ca 145NFuAZ013297 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=polymtl.ca; s=default; t=1620256562; bh=pc45n/BWF7lDKLmoC8+fLn/BhW3jQ7nH+5jK1B5rYNU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=nuaN8LfF7O+hFXk4ovvB4VaQ82brXcrghgJBxZS37ImCQHhHDcgtu+32xkIKehahe KXhPSRCLOFJI6zgAyheiCNuRZsrXWBqKkhkCN2UtF78u8AMOxLXSWRCrxrwq/bLWg2 89raNRow77e5tbFdw6GsG8sjF9wc3T1/PwiYrxno= Received: from [10.0.0.11] (192-222-157-6.qc.cable.ebox.net [192.222.157.6]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPSA id 631DE1E813; Wed, 5 May 2021 19:15:55 -0400 (EDT) Subject: Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads To: Stefan Metzmacher , Borislav Petkov , Peter Zijlstra Cc: Linus Torvalds , Andy Lutomirski , Thomas Gleixner , Jens Axboe , Linux Kernel Mailing List , io-uring , the arch/x86 maintainers , linux-toolchains@vger.kernel.org References: <8735v3ex3h.ffs@nanos.tec.linutronix.de> <3C41339D-29A2-4AB1-958F-19DB0A92D8D7@amacapital.net> <044d0bad-6888-a211-e1d3-159a4aeed52d@polymtl.ca> <932d65e1-5a8f-c86a-8673-34f0e006c27f@samba.org> <30e248aa-534d-37ff-2954-a70a454391fc@polymtl.ca> From: Simon Marchi Message-ID: <0bd34171-1e94-fab6-b186-3ddd21bacc0e@polymtl.ca> Date: Wed, 5 May 2021 19:15:55 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Wed, 5 May 2021 23:15:56 +0000 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Is it clear now? > metze Yes, thanks. I had missed that the point of the 2nd patch is to not do the memset for these threads. Makes sense now. Simon