From patchwork Tue Dec 1 14:37:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 11943085 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=-20.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 3676CC64E7B for ; Tue, 1 Dec 2020 14:38:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3AB920758 for ; Tue, 1 Dec 2020 14:38:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ddf6bVZ2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389244AbgLAOiE (ORCPT ); Tue, 1 Dec 2020 09:38:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:55796 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388116AbgLAOiD (ORCPT ); Tue, 1 Dec 2020 09:38:03 -0500 Received: from localhost (searspoint.nvidia.com [216.228.112.21]) (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 115B920757; Tue, 1 Dec 2020 14:37:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1606833442; bh=wZROcP5CZTMECo5kQllBGtqQbcBo45uTKS8WHm8zLhs=; h=From:To:Cc:Subject:Date:From; b=Ddf6bVZ2M0dNM1TuN3TRYlCdVBWt/Tc0MZMlZOyYvHzYiTUSUWnff82UoBikvuR9S ePAZE17dddi/GOBrCAtRBr/FxnKksZhBpZVsYCror0JBsuvUUU1WjHVtZpaRG8Idhi roXPI87pVn0xiyHMy8FliP8MO70XUeyJH6y7yVZk= From: Leon Romanovsky To: Masahiro Yamada , Alexei Starovoitov , Andrii Nakryiko , Michal Marek Cc: Leon Romanovsky , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Edward Srouji , Saeed Mahameed , bpf@vger.kernel.org, kernel-team@fb.com, netdev@vger.kernel.org Subject: [PATCH bpf-next] kbuild: Restore ability to build out-of-tree modules Date: Tue, 1 Dec 2020 16:37:00 +0200 Message-Id: <20201201143700.719828-1-leon@kernel.org> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org From: Leon Romanovsky The out-of-tree modules are built without vmlinux target and request to recompile that target unconditionally causes to the following compilation error. [root@server kernel]# make <..> make -f ./scripts/Makefile.modpost make -f ./scripts/Makefile.modfinal make[3]: *** No rule to make target 'vmlinux', needed by '/my_temp/out-of-tree-module/kernel/test.ko'. Stop. make[2]: *** [scripts/Makefile.modpost:117: __modpost] Error 2 make[1]: *** [Makefile:1703: modules] Error 2 make[1]: Leaving directory '/usr/src/kernels/5.10.0-rc5_for_upstream_base_2020_11_29_11_34' make: *** [Makefile:80: modules] Error 2 As a solution separate between build paths that has vmlinux target and paths without. Fixes: 5f9ae91f7c0d ("kbuild: Build kernel module BTFs if BTF is enabled and pahole supports it") Reported-by: Edward Srouji Signed-off-by: Leon Romanovsky --- Not proficient enough in Makefile, but it fixes the issue. --- scripts/Makefile.modfinal | 5 +++++ scripts/Makefile.modpost | 4 ++++ 2 files changed, 9 insertions(+) -- 2.28.0 diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal index 02b892421f7a..8a7d0604e7d0 100644 --- a/scripts/Makefile.modfinal +++ b/scripts/Makefile.modfinal @@ -48,9 +48,14 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \ $(cmd); \ printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) +ifdef MODPOST_VMLINUX # Re-generate module BTFs if either module's .ko or vmlinux changed $(modules): %.ko: %.o %.mod.o scripts/module.lds vmlinux FORCE +$(call if_changed_except,ld_ko_o,vmlinux) +else +$(modules): %.ko: %.o %.mod.o scripts/module.lds FORCE + +$(call if_changed_except,ld_ko_o) +endif ifdef CONFIG_DEBUG_INFO_BTF_MODULES +$(if $(newer-prereqs),$(call cmd,btf_ko)) endif diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index f54b6ac37ac2..f5aa5b422ad7 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -114,8 +114,12 @@ targets += $(output-symdump) __modpost: $(output-symdump) ifneq ($(KBUILD_MODPOST_NOFINAL),1) +ifdef MODPOST_VMLINUX + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal MODPOST_VMLINUX=1 +else $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal endif +endif PHONY += FORCE FORCE: