linux-kernel - Re: [PATCH 4/4] kbuild: re-implement CONFIG_TRIM_UNUSED

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Date:   Fri, 26 Feb 2021 05:06:43 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        kbuild-all@...ts.01.org, Christoph Hellwig <hch@....de>,
        Jessica Yu <jeyu@...nel.org>, Nicolas Pitre <nico@...xnic.net>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 4/4] kbuild: re-implement CONFIG_TRIM_UNUSED_KSYMS to make
 it work in one-pass

On Fri, Feb 26, 2021 at 3:47 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Masahiro,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on next-20210225]
> [cannot apply to kbuild/for-next asm-generic/master arm64/for-next/core m68k/for-next openrisc/for-next hp-parisc/for-next arc/for-next uclinux-h8/h8300-next nios2/for-linus v5.11]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url:    https://github.com/0day-ci/linux/commits/Masahiro-Yamada/kbuild-build-speed-improvment-of-CONFIG_TRIM_UNUSED_KSYMS/20210226-000929
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 29c395c77a9a514c5857c45ceae2665e9bd99ac7
> config: powerpc-mpc8313_rdb_defconfig (attached as .config)
> compiler: powerpc-linux-gcc (GCC) 9.3.0
> 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://github.com/0day-ci/linux/commit/014940331790a8cd9bee92c7201494ec3217201e
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Masahiro-Yamada/kbuild-build-speed-improvment-of-CONFIG_TRIM_UNUSED_KSYMS/20210226-000929
>         git checkout 014940331790a8cd9bee92c7201494ec3217201e
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> scripts/module.lds.S:7:5: warning: "CONFIG_TRIM_UNUSED_KSYMS" is not defined, evaluates to 0 [-Wundef]

Thanks. This should be #ifdef, of course.



>        7 | #if CONFIG_TRIM_UNUSED_KSYMS
>          |     ^~~~~~~~~~~~~~~~~~~~~~~~
>
>
> vim +/CONFIG_TRIM_UNUSED_KSYMS +7 scripts/module.lds.S
>
>    > 7  #if CONFIG_TRIM_UNUSED_KSYMS
>      8  #include <generated/keep-ksyms.h>
>      9
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org



-- 
Best Regards
Masahiro Yamada