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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 24A18C433DF for ; Thu, 21 May 2020 20:27:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E24B72078B for ; Thu, 21 May 2020 20:27:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jix5+TVi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729374AbgEUU1Y (ORCPT ); Thu, 21 May 2020 16:27:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728365AbgEUU1X (ORCPT ); Thu, 21 May 2020 16:27:23 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60966C05BD43 for ; Thu, 21 May 2020 13:27:22 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 186so6730590ybq.1 for ; Thu, 21 May 2020 13:27:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=GkG9xsAhJ+pShDH+d4d2X98f90rTaKTAoKNDQBhcics=; b=jix5+TViqcLHXWKoscSQIz+Kfk6XZkvQnlTigyaTIz0LFWBlXc6l1grS/3wsXGQDUr /mwfHPpmS8FZP2XpaJ5kdedErbZulbkz4ZAKG74YJXz/y255g8aJHC2EoAZIA4Yxzmhi kY54wIhor5QSc1JnETCzmRj7pxJcko3mumUxLKHd03E/lFENaQ13+PV/A9pEs+AB+LMb 35YFv37+TilxzLSyIGexDtjWfxb04cA3ydx02wBZ7WAa7t3J3Hg9FIwQ0lbz6RxJHy/U FIC8MBI3RB4eHrwFDVUSyx/TeQXkD9Pn+Zwn7hmv6oA1h8ZBL7NmYtOdca+gmYfMP9dz hCGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=GkG9xsAhJ+pShDH+d4d2X98f90rTaKTAoKNDQBhcics=; b=K7WD4+DIdfCUac0S6fwoEEvuY6cxftSLgrpdOgYU1QAM+qix+c9lrkji9a82Y6ceDY 6M8U/CwoOhG+yjP3NtkA2AfRZ+Zz4PPnyBlA8mI86OuHdwcg3F+HzQWO38w35s72q0Km ZaGg5Yt7G2fqYQz7eTApNsRt2Rxle2dXV2XESYpHdsbVe5ZsovKuHBh/TD8gXMpqmy8w 9/OW+rMGLJamzCZJRWw2KwPq4+BvQTNP4cZFuflNDUp2QEviWrt4QdzrIWMzoYdEWap6 NcZCbP5IHQTCCz1VxcWy5cJxRlgVJzwM9jRgawGAnhAsuNVPnMKXklpW6vcRgwPcwxID B2nA== X-Gm-Message-State: AOAM5336cwDLY47CbJbE/qeMmAEqPEn+0BYyUQEvdTfmVuYLNQxhPMLS vTPDfsphdn8HpNOLxuJ7EhcsS6L5WrNSoDowA24= X-Google-Smtp-Source: ABdhPJxkkMI44JP0E64EaF0MUV3zDrFTM8DJ9779Ya6G5m7K+7uFGA+yP08mMIGVPF67M3n6qjbT8kn/xVt2FmyfeLw= X-Received: by 2002:a25:c010:: with SMTP id c16mr3140273ybf.506.1590092841442; Thu, 21 May 2020 13:27:21 -0700 (PDT) Date: Thu, 21 May 2020 13:27:16 -0700 Message-Id: <20200521202716.193316-1-samitolvanen@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.27.0.rc0.183.gde8f92d652-goog Subject: [PATCH] kbuild: reuse vmlinux.o in vmlinux_link From: Sami Tolvanen To: Masahiro Yamada , Michal Marek Cc: Kees Cook , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Instead of linking all compilation units again each time vmlinux_link is called, reuse vmlinux.o from modpost_link. With x86_64 allyesconfig, vmlinux_link is called three times and reusing vmlinux.o reduces the build time ~38 seconds on my system (59% reduction in the time spent in vmlinux_link). Signed-off-by: Sami Tolvanen --- scripts/link-vmlinux.sh | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index d09ab4afbda4..c6cc4305950c 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -77,11 +77,8 @@ vmlinux_link() if [ "${SRCARCH}" != "um" ]; then objects="--whole-archive \ - ${KBUILD_VMLINUX_OBJS} \ + vmlinux.o \ --no-whole-archive \ - --start-group \ - ${KBUILD_VMLINUX_LIBS} \ - --end-group \ ${@}" ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \ base-commit: b85051e755b0e9d6dd8f17ef1da083851b83287d -- 2.27.0.rc0.183.gde8f92d652-goog