Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp1249296pxu; Wed, 6 Jan 2021 17:20:15 -0800 (PST) X-Google-Smtp-Source: ABdhPJzPb4+RGXdTSXAuwInSDz6hq3Gmv6zK+3NC09as7UUMId1KNSJMNNQmycRJj/15RLAEnipI X-Received: by 2002:aa7:d94e:: with SMTP id l14mr5685251eds.98.1609982415714; Wed, 06 Jan 2021 17:20:15 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1609982415; cv=none; d=google.com; s=arc-20160816; b=fBU9rsqUB2U1t3vQoObUQyrCUxImRQ4KS+Qo7CiY8JV1USMp/FIJO0FUkPEXyC8mnn XaR+TyQUun+4LWej4AbTwmMOSIISHb0qtTnBNnRe0svkOiU5MT7V6uQNqXzNnNqbB/JO iVjkpr8Yuqi7A44CkwAAeYmnYxqv4R9JeP2e5Ia8yqubIvmM03K8xNM/OChxx82ymQGf y4lH3fnDcWlsczNVdigM/juieMIUg/6/xEwrqbpNyWEhwAMSpDx++w71liYoIvAdcAqx TKy1BeF0epIu8Iy3mzWPhuLelfd/hoqsqUtcVLiDUb5lLgpdviBU51Dqaih865LIwc37 phRg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=FK0hAJXGs3OgiFVDhPssiDtgvkICixogkcLxgC3d1pw=; b=zei9qdUa1vLqoA1zUgLeZKxuErBvSfCXs31+fc6IMDx/W2Hp0WbcKcuXyEOTj4OWhB L6HaYAj2LmYbko6lWxsLzdkAsk6jPPcNBWqOiSwVwzSvwsWgXzD0NL/japwPP8ROwV4r 6oVD9KDO4UPc5/ELpvVWxM0sCODANwbUtaEEy00w5WStefBO8AHLRdRnyzTanGCssr4s hJ8dczl3P4Lxoa1YXHoDKFa7PdTrRSVcbZDq59Wr8l8zWHHyg3CpUiWtUF+fp51rppiT M2FzusLstSWj03UfIybR31agpFnTlkyZD75zqvw534z2cuuqEtTn0n1yOSP2kAHCSDF6 1bhQ== ARC-Authentication-Results: i=1; mx.google.com; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id gf17si1531651ejb.338.2021.01.06.17.19.52; Wed, 06 Jan 2021 17:20:15 -0800 (PST) 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; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726439AbhAGBRa (ORCPT + 99 others); Wed, 6 Jan 2021 20:17:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:60230 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726086AbhAGBRa (ORCPT ); Wed, 6 Jan 2021 20:17:30 -0500 Received: from oasis.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6F2862311E; Thu, 7 Jan 2021 01:16:47 +0000 (UTC) Date: Wed, 6 Jan 2021 20:16:45 -0500 From: Steven Rostedt To: Linus Torvalds Cc: Willem de Bruijn , Jakub Kicinski , David Miller , Jonathan Lemon , Thomas Gleixner , LKML , "the arch/x86 maintainers" , Christoph Hellwig , Matthew Wilcox , Daniel Vetter , Andrew Morton , Linux-MM , Peter Zijlstra , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Netdev Subject: Re: [BUG] from x86: Support kmap_local() forced debugging Message-ID: <20210106201645.72f57a47@oasis.local.home> In-Reply-To: References: <20201118194838.753436396@linutronix.de> <20201118204007.169209557@linutronix.de> <20210106180132.41dc249d@gandalf.local.home> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 6 Jan 2021 17:03:48 -0800 Linus Torvalds wrote: > (although I wonder how/why the heck you've enabled > CC_OPTIMIZE_FOR_SIZE=y, which is what causes "memcpy()" to be done as > that "rep movsb". I thought we disabled it because it's so bad on most > cpus). Why? Because to test x86_32, I have a Fedora Core 13 (yes 13!) partition (baremetal) that I use. And the .config I use for it hasn't changed since that time ;-) (except to add new features that I want to test on x86_32). Anyway, I'll test out your patch. Thanks for investigating this. -- Steve