From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728365AbgEUU1W (ORCPT ); Thu, 21 May 2020 16:27:22 -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 4388AC061A0E for ; Thu, 21 May 2020 13:27:22 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 207so6747027ybl.2 for ; Thu, 21 May 2020 13:27:22 -0700 (PDT) Date: Thu, 21 May 2020 13:27:16 -0700 Message-Id: <20200521202716.193316-1-samitolvanen@google.com> Mime-Version: 1.0 Subject: [PATCH] kbuild: reuse vmlinux.o in vmlinux_link From: Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Masahiro Yamada , Michal Marek Cc: Kees Cook , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Sami Tolvanen 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