linux-kernel - Re: ld.lld: error: undefined symbol: firmware_upload

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Date:   Fri, 11 Nov 2022 13:59:40 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Russ Weight <russell.h.weight@...el.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Xu Yilun <yilun.xu@...el.com>
Subject: Re: ld.lld: error: undefined symbol: firmware_upload_register

Hi--

On 11/9/22 04:30, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   f141df371335645ce29a87d9683a3f79fba7fd67
> commit: 5cd339b370e29b04b85fbb83f40496991465318e fpga: m10bmc-sec: add max10 secure update functions
> date:   5 months ago
> config: mips-buildonly-randconfig-r004-20221109
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 463da45892e2d2a262277b91b96f5f8c05dc25d0)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install mips cross compiling tool for clang build
>         # apt-get install binutils-mips-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5cd339b370e29b04b85fbb83f40496991465318e
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 5cd339b370e29b04b85fbb83f40496991465318e
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>>> ld.lld: error: undefined symbol: firmware_upload_register
>    >>> referenced by intel-m10-bmc-sec-update.c
>    >>>               fpga/intel-m10-bmc-sec-update.o:(m10bmc_sec_probe) in archive drivers/built-in.a
> --
>>> ld.lld: error: undefined symbol: firmware_upload_unregister
>    >>> referenced by intel-m10-bmc-sec-update.c
>    >>>               fpga/intel-m10-bmc-sec-update.o:(m10bmc_sec_remove) in archive drivers/built-in.a


This happens when (bool) CONFIG_FW_UPLOAD=y and CONFIG_FW_LOADER=m.
Ah, it's the old "bool depending on a tristate" problem.

There may be some Makefile fix for this - I don't know.

Or the Kconfig fix works AFAICT (below). Change FW_UPLOAD to a tristate
and modify 2 header files for exports/inlines.

Luis -- how was FW_LOADER=m and FW_UPLOAD=y supposed to work?

Thanks.
-- 
---
 drivers/base/firmware_loader/Kconfig |    2 +-
 drivers/base/firmware_loader/sysfs.h |    2 +-
 include/linux/firmware.h             |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff -- a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
--- a/drivers/base/firmware_loader/Kconfig
+++ b/drivers/base/firmware_loader/Kconfig
@@ -204,7 +204,7 @@ config FW_CACHE
 	  If unsure, say Y.
 
 config FW_UPLOAD
-	bool "Enable users to initiate firmware updates using sysfs"
+	tristate "Enable users to initiate firmware updates using sysfs"
 	select FW_LOADER_SYSFS
 	select FW_LOADER_PAGED_BUF
 	help
diff -- a/drivers/base/firmware_loader/sysfs.h b/drivers/base/firmware_loader/sysfs.h
--- a/drivers/base/firmware_loader/sysfs.h
+++ b/drivers/base/firmware_loader/sysfs.h
@@ -99,7 +99,7 @@ struct fw_sysfs *
 fw_create_instance(struct firmware *firmware, const char *fw_name,
 		   struct device *device, u32 opt_flags);
 
-#ifdef CONFIG_FW_UPLOAD
+#if IS_ENABLED(CONFIG_FW_UPLOAD)
 extern struct device_attribute dev_attr_status;
 extern struct device_attribute dev_attr_error;
 extern struct device_attribute dev_attr_cancel;
diff -- a/include/linux/firmware.h b/include/linux/firmware.h
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -170,7 +170,7 @@ static inline int request_partial_firmwa
 
 #endif
 
-#ifdef CONFIG_FW_UPLOAD
+#if IS_ENABLED(CONFIG_FW_UPLOAD)
 
 struct fw_upload *
 firmware_upload_register(struct module *module, struct device *parent,