From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 43863239085; Fri, 9 May 2025 16:43:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746809024; cv=none; b=bvUPG2+WlbXA5NiZ1BrZfVqwcJGnLbmT8ZojGHWu5gn3amyws8EavSEC+X4QCB5M1lkQEiXKzk41wotNXf5p0TeddO7E8YbaxcxXGKQrVmmpLX05Xi/UMODd1frVBvkJUg4Z90forKTqj4eC0BIiCj+HSgCrjEdqXY1rq9xCcyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746809024; c=relaxed/simple; bh=MqLt72NbV0WYuDvCjbfFRnilM/7OjYL1Z4TBFF38kms=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bc/niShmtQdsDbXktJ6JgnGpwMRGeEoHsAQ6FSWZcpLP8hKdbSaFGimh2pl7JkUa+/gbtkvNW1+7dhyRjXKP8La5PstunJwZWYc7eZ7DQ9fQgMLK2hjMbcQs/FcQWK+JtMA3D+toPEPJqvVvLpck7bG1Fu+4c3Chu7dTySmNg5A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LhghHEEB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LhghHEEB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C659DC4CEE4; Fri, 9 May 2025 16:43:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746809024; bh=MqLt72NbV0WYuDvCjbfFRnilM/7OjYL1Z4TBFF38kms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LhghHEEBld3AW1ff59FiFLvsMTjt2nWBEh4rEFF1VcLnFoIka9z4d06DQYOMy0UVI KyfUFY8tLA7JlYH71G4r3Kwg9BWOSpY62Z7krZmHOUjUu6cDn1vKJehMILFJHRiByp dHLR/juNAfN1AsuYBSsP51tKO/IQO2v5c8sAzmELFqFDiRX8sl0NfEYI2c5wMDrbrL UpDJBo6/PNcic8jmWhzzQIMDFC1nNe3x3jmE3+8ZUOhMLu90uwuuaF3XRsqtGdYpYF 5w5GUeWgHLn3vKmV8RBCwuqRX2VxbnqKylnDa1mhYbmedDjBq8wCow/axzJU1hLcm8 RWbgnb6HqWYLw== From: Alexey Gladkov To: Petr Pavlu , Luis Chamberlain , Sami Tolvanen , Daniel Gomez , Masahiro Yamada , Nathan Chancellor , Nicolas Schier Cc: linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, linux-kbuild@vger.kernel.org, Alexey Gladkov Subject: [PATCH v2 4/6] modpost: Create modalias for builtin modules Date: Fri, 9 May 2025 18:42:35 +0200 Message-ID: <20250509164237.2886508-5-legion@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit For some modules, modalias is generated using the modpost utility and the section is added to the module file. When a module is added inside vmlinux, modpost does not generate modalias for such modules and the information is lost. As a result kmod (which uses modules.builtin.modinfo in userspace) cannot determine that modalias is handled by a builtin kernel module. $ cat /sys/devices/pci0000:00/0000:00:14.0/modalias pci:v00008086d0000A36Dsv00001043sd00008694bc0Csc03i30 $ modinfo xhci_pci name: xhci_pci filename: (builtin) license: GPL file: drivers/usb/host/xhci-pci description: xHCI PCI Host Controller Driver Missing modalias "pci:v*d*sv*sd*bc0Csc03i30*" which will be generated by modpost if the module is built separately. To fix this it is necessary to generate the same modalias for vmlinux as for the individual modules. Fortunately '.vmlinux.export.o' is already generated from which '.modinfo' can be extracted in the same way as for vmlinux.o. Signed-off-by: Masahiro Yamada Signed-off-by: Alexey Gladkov --- include/linux/module.h | 4 ---- scripts/mod/file2alias.c | 16 ++++++++++++++++ scripts/mod/modpost.c | 13 ++++++++++++- scripts/mod/modpost.h | 2 ++ 4 files changed, 30 insertions(+), 5 deletions(-) diff --git a/include/linux/module.h b/include/linux/module.h index 01fceca47a5b..17e69e4a1802 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -259,14 +259,10 @@ struct module_kobject *lookup_or_create_module_kobject(const char *name); __PASTE(type, \ __PASTE(__, name))))))) -#ifdef MODULE /* Creates an alias so file2alias.c can find device table. */ #define MODULE_DEVICE_TABLE(type, name) \ extern typeof(name) __mod_device_table(type, name) \ __attribute__ ((unused, alias(__stringify(name)))) -#else /* !MODULE */ -#define MODULE_DEVICE_TABLE(type, name) -#endif /* Version of form [:][-]. * Or for CVS/RCS ID version, everything but the number is stripped. diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index dff1799a4c79..d42f2c742fd6 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -1527,5 +1527,21 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, } } + if (mod->is_vmlinux) { + struct module_alias *alias; + + /* + * If this is vmlinux, record the name of the builtin module. + * Traverse the linked list in the reverse order, and set the + * builtin_modname unless it has already been set in the + * previous call. + */ + list_for_each_entry_reverse(alias, &mod->aliases, node) { + if (alias->builtin_modname) + break; + alias->builtin_modname = xstrndup(modname, modnamelen); + } + } + free(zeros); } diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index be89921d60b6..c7c601c6f82d 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -2021,11 +2021,22 @@ static void write_if_changed(struct buffer *b, const char *fname) static void write_vmlinux_export_c_file(struct module *mod) { struct buffer buf = { }; + struct module_alias *alias, *next; buf_printf(&buf, - "#include \n"); + "#include \n" + "#include \n"); add_exported_symbols(&buf, mod); + + list_for_each_entry_safe(alias, next, &mod->aliases, node) { + buf_printf(&buf, "MODULE_ALIAS_MODNAME(\"%s\", \"%s\");\n", + alias->builtin_modname, alias->str); + list_del(&alias->node); + free(alias->builtin_modname); + free(alias); + } + write_if_changed(&buf, ".vmlinux.export.c"); free(buf.p); } diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 9133e4c3803f..2aecb8f25c87 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -99,10 +99,12 @@ buf_write(struct buffer *buf, const char *s, int len); * struct module_alias - auto-generated MODULE_ALIAS() * * @node: linked to module::aliases + * @modname: name of the builtin module (only for vmlinux) * @str: a string for MODULE_ALIAS() */ struct module_alias { struct list_head node; + char *builtin_modname; char str[]; }; -- 2.49.0