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=-2.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 0080BC432C0 for ; Mon, 18 Nov 2019 02:30:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C5907206D6 for ; Mon, 18 Nov 2019 02:30:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="YhYa/eN1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726328AbfKRCas (ORCPT ); Sun, 17 Nov 2019 21:30:48 -0500 Received: from mail-pf1-f177.google.com ([209.85.210.177]:39026 "EHLO mail-pf1-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726068AbfKRCas (ORCPT ); Sun, 17 Nov 2019 21:30:48 -0500 Received: by mail-pf1-f177.google.com with SMTP id x28so9600528pfo.6 for ; Sun, 17 Nov 2019 18:30:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=v8BAWdRTBsXRM8xdSToodwMOCDg93ZmO7iNpdniRA1s=; b=YhYa/eN1/0CYmCrBfLipG4tNs7hUM2OspQjH0ajp8lzwCz5POfa0zWoBz9cXGUxZdl knYZhCtZe1LuBDcxRPXlQKD86u2nVIL4Pez8iFZ9e0DkoqxhruLlJUMG57SpxO5lcXnb Eddw1zTtJnbFlY01xHJOZrZcdYMdNp0XEoXbvg/t8BWvt1QUQN/0yhUFS49/Kk+xSMEO goQA3DcV6IZM/ts4iL94rVvIz7JirIOOohGEhvm8KNaOzJUtC+XQ9R2vdfiyW0HMtwAT ulbFuhgN+QOLLUO5USyDogwsqZzM3+mGjMLJop6YV6at95DO5rsy9gMJngj4QZBvYHk3 97jw== 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-language :content-transfer-encoding; bh=v8BAWdRTBsXRM8xdSToodwMOCDg93ZmO7iNpdniRA1s=; b=rNH6GT69sBtSEcz0Gu6ZPw+ak+qvnJXuSHVviPHK9jla1H8hDCFLm7lsJ9e+u/WtWG 1Q7+r5wkHcFWotGVs6ie2NQqmnU6/ZsHQb4EXFIvY3YaJrZda3NohMq9RCQrabBO5cac tE4TbfZ+FNcn3+XowTtwdx3iuiVNzHVgrpRsUkhMoe15ZErPJbPw3nCz3sHiKLoMPuG0 iEQ/1aZniIEB6T+ufObovtyw4/DEBqF0BBzQSFSbViC4f79Ark3YZ5E6sPiLnBFLxSTh XMkfcbhaMWtlGACqGLIGjaZk8CYUtZ4mvdzH9HTboajGUP8BYQHjbadQElig4bBn8CHl CBRQ== X-Gm-Message-State: APjAAAXujwcsPgceCFoW99O+GTX/HUFgyLD1L0oq11fz9lzfykhLIq0v hn9Nv6JqAEvt+4USVv6K+TQVxVspOKk= X-Google-Smtp-Source: APXvYqx3pA+d8Gd38MjrEOEeopWnEcuRlRvpg9kJlJbbc+eA1td1lda41Q7Mfwbhi8fdHqf+0Ta2EA== X-Received: by 2002:a63:ed43:: with SMTP id m3mr12428483pgk.261.1574044245656; Sun, 17 Nov 2019 18:30:45 -0800 (PST) Received: from [192.168.1.188] ([66.219.217.79]) by smtp.gmail.com with ESMTPSA id s66sm21543885pfb.38.2019.11.17.18.30.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Nov 2019 18:30:44 -0800 (PST) Subject: Re: building individual files in subdirectories To: Masahiro Yamada , Christoph Hellwig Cc: Linux Kbuild mailing list , Linux Kernel Mailing List References: <20190528121148.GA18162@lst.de> From: Jens Axboe Message-ID: Date: Sun, 17 Nov 2019 19:30:42 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/17/19 5:15 PM, Masahiro Yamada wrote: > Hi Jens, > > > (related to https://lkml.org/lkml/2019/11/15/1152) > > > I received questions about single builds not working properly > some times in the past. > > For example, the following is a post from Christoph to kbuild ML, > and my reply to it. I'm not saying it isn't useful, what I'm saying is that slowing things down by almost 100% seems excessive! -- Jens Axboe