linux-kernel - Re: ERROR: modpost: "__divsi3_table" [lib/lz4/lz4

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Date:   Wed, 23 Nov 2022 18:56:13 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Dinh Nguyen <dinguyen@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Michael Tretter <m.tretter@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: ERROR: modpost: "__divsi3_table" [lib/lz4/lz4_compress.ko]
 undefined!

[adding NIOS2 maintainer]

On 9/20/22 01:33, kernel test robot wrote:
> Hi Randy,
> 
> First bad commit (maybe != root cause):

Yes, not related.

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   521a547ced6477c54b4b0cc206000406c221b4d6
> commit: 81e005842d0b8167c059553a1c29c36d8a7a9329 media: isl7998x: select V4L2_FWNODE to fix build error
> date:   3 months ago
> config: nios2-buildonly-randconfig-r001-20220919
> compiler: nios2-linux-gcc (GCC) 12.1.0
> 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
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=81e005842d0b8167c059553a1c29c36d8a7a9329
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 81e005842d0b8167c059553a1c29c36d8a7a9329
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 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 >>, old ones prefixed by <<):
> 
>>> ERROR: modpost: "__divsi3_table" [lib/lz4/lz4_compress.ko] undefined!

Due to -O3 optimization in lib/lz4/Makefile:

# SPDX-License-Identifier: GPL-2.0-only
ccflags-y += -O3

obj-$(CONFIG_LZ4_COMPRESS) += lz4_compress.o
obj-$(CONFIG_LZ4HC_COMPRESS) += lz4hc_compress.o
obj-$(CONFIG_LZ4_DECOMPRESS) += lz4_decompress.o

It builds fine without -O3.
-- 
~Randy