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=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 6484EC636CA for ; Sun, 18 Jul 2021 19:47:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 412556108B for ; Sun, 18 Jul 2021 19:47:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229585AbhGRTuZ (ORCPT ); Sun, 18 Jul 2021 15:50:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229615AbhGRTuY (ORCPT ); Sun, 18 Jul 2021 15:50:24 -0400 Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9E25C061764 for ; Sun, 18 Jul 2021 12:47:25 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id m83so14439647pfd.0 for ; Sun, 18 Jul 2021 12:47:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=sm9UXKWaOLmMdgyMPazNRI82mVI5gEErdQZuVKNglDA=; b=scrr6ospx/Cx4jnO+AtQts8mDAeJ75Mm9KbY0Ftc3QsibsTRNKTRgLKPcEzVdB7J+t eLmWjM7Jj8yEcNrnZsMotyerkIhJRg2jDOC5EvMdkzxHddLy7l4OjvAKKQGj8tczg6iR uXiKlo3woy3oQzj2mPXHC3LFns7/D2mh+nx2aiDvgdHYz05SDLrulxJksiHRuNtwJjBg F4XTJXpRBvne/XVs4fPvM9k3rkM63UzFwOHcgQZ1kPyu7EIZHG5IneeJeyV64FhKzkIL wMSHWrgLFVS066UAR23gf2CUk6aY6oIBR46+rvA5FAQ5DDRQ8InSwmbTvXsODC6rT5v2 /M1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=sm9UXKWaOLmMdgyMPazNRI82mVI5gEErdQZuVKNglDA=; b=eXWCHkSzTXghZl7BEy/TnLzaLsTUTx/mSYd8KfDOewP13npzIiAWrcS6aH4n3iEvqw dj94Z1XWO1AiusDkf3sXw1dpsmz5XMJjSW0gZfiAQaG6IpcPp3W15+9RrnvG567A/cKj /uxg2vyF+ufTzBVr+LrxQPWraCPs0lZFhGGmjIxPlap90tSTp4mZf7YD2Hkdrg4psJfm W6QlTIXh6zr1lM+bj8OBWzGUZgQ2hCxQ7XFiHM6MT0XG/XOieC6zZpg906G8S2TPFiSx HjQ3z2VdTzpKLAOGQXUNifuvHWpsy4zD/PZXAVhEFSH91RbBqr3Sg69Hjwv8lhsLQu2Z nt/w== X-Gm-Message-State: AOAM532KnFlroRoC0e1zI4r1nXflhje70tM8zTPx6aPcV5wUkEl7Ei7X AU279J2aY63qBRo4DWVaI+w= X-Google-Smtp-Source: ABdhPJwX/+vSGgzp5FnzD8Hb5DeH0gjbC5OeLzCVIYz0K1i0bzchyKVzwyfharMGyPe2NseBtpIaaA== X-Received: by 2002:a63:ed12:: with SMTP id d18mr21134634pgi.12.1626637645267; Sun, 18 Jul 2021 12:47:25 -0700 (PDT) Received: from ?IPv6:2001:df0:0:200c:c0c0:b5db:8872:c62b? ([2001:df0:0:200c:c0c0:b5db:8872:c62b]) by smtp.gmail.com with ESMTPSA id o9sm17913235pfh.217.2021.07.18.12.47.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 18 Jul 2021 12:47:24 -0700 (PDT) Subject: Re: [PATCH v4 0/3] m68k: Improved switch stack handling To: Andreas Schwab Cc: "Eric W. Biederman" , geert@linux-m68k.org, linux-arch@vger.kernel.org, linux-m68k@lists.linux-m68k.org, torvalds@linux-foundation.org References: <1624407696-20180-1-git-send-email-schmitzmic@gmail.com> <87zgunzovm.fsf@disp2133> <3b4f287b-7be2-0e7b-ae5a-6c11972601fb@gmail.com> <1b656c02-925c-c4ba-03d3-f56075cdfac5@gmail.com> <8735scvklk.fsf@disp2133> <87a6mj99vf.fsf@igel.home> From: Michael Schmitz Message-ID: <1ebfb9de-de16-d05c-ea15-a110857fe284@gmail.com> Date: Mon, 19 Jul 2021 07:47:19 +1200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <87a6mj99vf.fsf@igel.home> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Hi Andreas, On 18/07/21 10:47 pm, Andreas Schwab wrote: > On Jul 18 2021, Michael Schmitz wrote: > >> + addql #8,%sp >> + addql #8,%sp >> + addql #8,%sp >> + addql #8,%sp >> + addql #8,%sp >> + addql #4,%sp > aka lea 44(%sp),%sp Thanks - I knew there should be a better way. Somewhere in entry.S is addql #8,%sp addql #4,%sp - is that faster than lea 12(%sp),%sp ? Cheers, Michael