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=-19.7 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,USER_AGENT_GIT autolearn=unavailable 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 71C01C433ED for ; Wed, 5 May 2021 16:42:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5761B61621 for ; Wed, 5 May 2021 16:42:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235021AbhEEQnO (ORCPT ); Wed, 5 May 2021 12:43:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:39658 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235338AbhEEQjO (ORCPT ); Wed, 5 May 2021 12:39:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 813CE613C4; Wed, 5 May 2021 16:33:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620232438; bh=GrUZF6GbsZHI9+wKvQm4efPYNohePcq8A61DrT0KvYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YCAnxuYXfjHNoObSpY87m630kTC3gDO10JMBx1IgUE1iiPfs4/HCdp9H76WLTnIM6 un1CKR1BUFjrxTo+IdU3Z/sw8vRwBTqjQmCc9S45pBWUfTnvYxHUoybFJ60dxzemR+ rTJJI1X2v1SOr64lfLjcvNcNNBiwgBvjwloY3TPkB3orb75FFQg/PNQQsH3Hu+7F/D ESMS/1YWDo7M6R+Zeb/8vjjqEukJyO/T0Yv+kzd8uND5o5qlMYs/S4b1U2X2zoTx5N 4avXJ1OBPiCxrrzaaSZYkpa0twB4eY8ZZ/LGnlMe4H8SUgQEdFTgnbVQgnw/ctrOZU InE3rJcwRHP2Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masahiro Yamada , Sasha Levin , linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org Subject: [PATCH AUTOSEL 5.12 108/116] kbuild: generate Module.symvers only when vmlinux exists Date: Wed, 5 May 2021 12:31:16 -0400 Message-Id: <20210505163125.3460440-108-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210505163125.3460440-1-sashal@kernel.org> References: <20210505163125.3460440-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masahiro Yamada [ Upstream commit 69bc8d386aebbd91a6bb44b6d33f77c8dfa9ed8c ] The external module build shows the following warning if Module.symvers is missing in the kernel tree. WARNING: Symbol version dump "Module.symvers" is missing. Modules may not have dependencies or modversions. I think this is an important heads-up because the resulting modules may not work as expected. This happens when you did not build the entire kernel tree, for example, you might have prepared the minimal setups for external modules by 'make defconfig && make modules_preapre'. A problem is that 'make modules' creates Module.symvers even without vmlinux. In this case, that warning is suppressed since Module.symvers already exists in spite of its incomplete content. The incomplete (i.e. invalid) Module.symvers should not be created. This commit changes the second pass of modpost to dump symbols into modules-only.symvers. The final Module.symvers is created by concatenating vmlinux.symvers and modules-only.symvers if both exist. Module.symvers is supposed to collect symbols from both vmlinux and modules. It might be a bit confusing, and I am not quite sure if it is an official interface, but presumably it is difficult to rename it because some tools (e.g. kmod) parse it. Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- .gitignore | 1 + Documentation/dontdiff | 1 + Makefile | 2 +- scripts/Makefile.modpost | 15 ++++++++++++++- scripts/mod/modpost.c | 15 +-------------- 5 files changed, 18 insertions(+), 16 deletions(-) diff --git a/.gitignore b/.gitignore index 3af66272d6f1..127012c1f717 100644 --- a/.gitignore +++ b/.gitignore @@ -57,6 +57,7 @@ modules.order /tags /TAGS /linux +/modules-only.symvers /vmlinux /vmlinux.32 /vmlinux.symvers diff --git a/Documentation/dontdiff b/Documentation/dontdiff index e361fc95ca29..82e3eee7363b 100644 --- a/Documentation/dontdiff +++ b/Documentation/dontdiff @@ -178,6 +178,7 @@ mktables mktree mkutf8data modpost +modules-only.symvers modules.builtin modules.builtin.modinfo modules.nsdeps diff --git a/Makefile b/Makefile index 78b0941f0de4..50c82ed67f6d 100644 --- a/Makefile +++ b/Makefile @@ -1513,7 +1513,7 @@ endif # CONFIG_MODULES # make distclean Remove editor backup files, patch leftover files and the like # Directories & files removed with 'make clean' -CLEAN_FILES += include/ksym vmlinux.symvers \ +CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ modules.builtin modules.builtin.modinfo modules.nsdeps \ compile_commands.json .thinlto-cache diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 066beffca09a..4ca5579af4e4 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -68,7 +68,20 @@ else ifeq ($(KBUILD_EXTMOD),) input-symdump := vmlinux.symvers -output-symdump := Module.symvers +output-symdump := modules-only.symvers + +quiet_cmd_cat = GEN $@ + cmd_cat = cat $(real-prereqs) > $@ + +ifneq ($(wildcard vmlinux.symvers),) + +__modpost: Module.symvers +Module.symvers: vmlinux.symvers modules-only.symvers FORCE + $(call if_changed,cat) + +targets += Module.symvers + +endif else diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 24725e50c7b4..10c3fba26f03 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -2423,19 +2423,6 @@ static void read_dump(const char *fname) fatal("parse error in symbol dump file\n"); } -/* For normal builds always dump all symbols. - * For external modules only dump symbols - * that are not read from kernel Module.symvers. - **/ -static int dump_sym(struct symbol *sym) -{ - if (!external_module) - return 1; - if (sym->module->from_dump) - return 0; - return 1; -} - static void write_dump(const char *fname) { struct buffer buf = { }; @@ -2446,7 +2433,7 @@ static void write_dump(const char *fname) for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { symbol = symbolhash[n]; while (symbol) { - if (dump_sym(symbol)) { + if (!symbol->module->from_dump) { namespace = symbol->namespace; buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n", symbol->crc, symbol->name, -- 2.30.2