Subject: Re: [next] arch/arm/kernel/setup.c:1028:63: error: 'SECTION_SIZE' undeclared

From: Stephen Rothwell <[email-masked]>
Date: Sat, 29 Jan 2022 14:07:10 +1100

Hi all,

On Fri, 28 Jan 2022 20:51:53 +0530 Naresh Kamboju <[email-masked]> wrote:
>
> Following build errors noticed on Linux next 20220128 arm with tinyconfig.
> 
> make --silent --keep-going --jobs=8 \
>    ARCH=arm \
>    CROSS_COMPILE=arm-linux-gnueabihf- \
>    'CC=sccache arm-linux-gnueabihf-gcc' \
>    'HOSTCC=sccache gcc'
> 
> arch/arm/kernel/setup.c: In function 'reserve_crashkernel':
> arch/arm/kernel/setup.c:1028:63: error: 'SECTION_SIZE' undeclared
> (first use in this function); did you mean 'SECTIONS_SHIFT'?
>  1028 |                 start = memblock_phys_alloc_range(crash_size,
> SECTION_SIZE,
>       |
> ^~~~~~~~~~~~
>       |
> SECTIONS_SHIFT
> arch/arm/kernel/setup.c:1028:63: note: each undeclared identifier is
> reported only once for each function it appears in
> make[3]: *** [scripts/Makefile.build:289: arch/arm/kernel/setup.o] Error 1
> 
> 
> Reported-by: Linux Kernel Functional Testing <[email-masked]>
> 
> meta data:
> -----------
>     git describe: next-20220128
>     git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>     git_sha: b605fdc54c2b28c30ef06d9db99282d8a32ae4be
>     target_arch: arm
>     kconfig: tinyconfig
>     toolchain: gcc-11
> 
> Build log:
> -------------
> https://builds.tuxbuild.com/24JPvTrXx7HvkQtxoIXqZtZoZkA/
> 
> Steps to reproduce:
> --------------------
> # To install tuxmake on your system globally:
> # sudo pip3 install -U tuxmake
> #
> # See https://docs.tuxmake.org/ for complete documentation.
> # Original tuxmake command with fragments listed below.
> 
> tuxmake --runtime podman --target-arch arm --toolchain gcc-11
> --kconfig tinyconfig
> 
> --
> Linaro LKFT
> https://lkft.linaro.org

Caused by commit

  35f56ebeffca ("arm: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef")

from Andrew's patch series.

I assume CONFIG_MMU is not set in tinyconfig for arm (so neither of
asm/pgtable-[23]level.h are included by asm/pgtable.h)?  CONFIG_KEXEC
depends on CONFIG_MMU.
-- 
Cheers,
Stephen Rothwell