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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_RED,USER_AGENT_SANE_2 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 14223C433E0 for ; Thu, 7 Jan 2021 01:16:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6FDEF23120 for ; Thu, 7 Jan 2021 01:16:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6FDEF23120 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B25C28D010E; Wed, 6 Jan 2021 20:16:51 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id AAFDB8D0090; Wed, 6 Jan 2021 20:16:51 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 978DA8D010E; Wed, 6 Jan 2021 20:16:51 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id 7DDA88D0090 for ; Wed, 6 Jan 2021 20:16:51 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 4BAE83633 for ; Thu, 7 Jan 2021 01:16:51 +0000 (UTC) X-FDA: 77677214622.01.mice30_4511a31274e6 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 38FA21004EC4E for ; Thu, 7 Jan 2021 01:16:51 +0000 (UTC) X-HE-Tag: mice30_4511a31274e6 X-Filterd-Recvd-Size: 2621 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Thu, 7 Jan 2021 01:16:50 +0000 (UTC) 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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