From patchwork Thu Mar 3 08:36:30 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 8490141 Return-Path: X-Original-To: patchwork-linux-kbuild@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BCF22C0553 for ; Thu, 3 Mar 2016 08:36:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D4858201CD for ; Thu, 3 Mar 2016 08:36:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2CA9201C7 for ; Thu, 3 Mar 2016 08:36:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756582AbcCCIg1 (ORCPT ); Thu, 3 Mar 2016 03:36:27 -0500 Received: from conuserg011.nifty.com ([202.248.44.37]:51088 "EHLO conuserg011-v.nifty.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751279AbcCCIg0 (ORCPT ); Thu, 3 Mar 2016 03:36:26 -0500 Received: from beagle.diag.org (p14090-ipngnfx01kyoto.kyoto.ocn.ne.jp [153.142.97.90]) (authenticated) by conuserg011-v.nifty.com with ESMTP id u238ZqG3007195; Thu, 3 Mar 2016 17:35:52 +0900 X-Nifty-SrcIP: [153.142.97.90] From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: Masahiro Yamada , David Howells , Michal Marek , David Woodhouse , linux-kernel@vger.kernel.org Subject: [PATCH] kbuild: suppress annoying "... is up to date." message Date: Thu, 3 Mar 2016 17:36:30 +0900 Message-Id: <1456994190-15582-1-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Under certain conditions, Kbuild shows "... is up to date" where if_changed or friends are used. For example, the incremental build of ARM64 Linux shows this message when the kernel image has not been updated. $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHK include/generated/compile.h CHK kernel/config_data.h make[1]: `arch/arm64/boot/Image.gz' is up to date. Building modules, stage 2. MODPOST 0 modules The following is the build rule in arch/arm64/boot/Makefile: $(obj)/Image.gz: $(obj)/Image FORCE $(call if_changed,gzip) If the Image.gz is newer than the Image and the command line has not changed (i.e., $(any-prereq) and $(arg-check) are both empty), the build rule $(call if_changed,gzip) is evaluated to be empty, then GNU Make reports the target is up to date. In order to make GNU Make quiet, we need to give it something to do, for example, "@:". This should be fixed in the Kbuild core part rather than in each Makefile. Signed-off-by: Masahiro Yamada --- scripts/Kbuild.include | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 1db6d73..b2ab2a9 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -251,7 +251,7 @@ any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ - printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) + printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ @@ -259,14 +259,14 @@ if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ $(echo-cmd) $(cmd_$(1)); \ scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ rm -f $(depfile); \ - mv -f $(dot-target).tmp $(dot-target).cmd) + mv -f $(dot-target).tmp $(dot-target).cmd, @:) # Usage: $(call if_changed_rule,foo) # Will check if $(cmd_foo) or any of the prerequisites changed, # and if so will execute $(rule_foo). if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ @set -e; \ - $(rule_$(1))) + $(rule_$(1)), @:) ### # why - tell why a a target got build