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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Tue, 15 Sep 2020 11:56:55 +0900
Message-ID: <CAK7LNARw0aRmKLb+8mxZbzxvB0YQ2_ak5LpcpQy+=3HrtiFA1g@mail.gmail.com>
Subject: Re: [question] KBUILD_OUTPUT and modules install (with INSTALL_MOD_PATH)
To:     Frank Wunderlich <frank-w@public-files.de>
Cc:     Michal Marek <michal.lkml@markovi.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, Sep 15, 2020 at 2:57 AM Frank Wunderlich
<frank-w@public-files.de> wrote:
>
> Hi,
>
> i try to use modules_install target after building kernel with KBUILD_OUTPUT set
>
> KBUILD_OUTPUT: /media/data_nvme/git/kernel/build #kernel source is in /media/data_nvme/git/kernel/BPI-R2-4.14
>
> kernel is build successfully, but i fail on running the make modules_install target
>
>   ERROR: Kernel configuration is invalid.
>          include/generated/autoconf.h or include/config/auto.conf are missing.
>          Run 'make oldconfig && make prepare' on kernel src to fix it.
>
> Makefile:648: include/config/auto.conf: No such file or directory
> make: *** [Makefile:719: include/config/auto.conf] Error 1
>
> it looks it is ignoring the KBUILD_OUTPUT variable, as both files are present


KBUILD_OUTPUT is an environment variable.

Did you set (export) it
before doing 'make modules_install'?


> $ ls /media/data_nvme/git/kernel/build/include/config/auto.conf
> /media/data_nvme/git/kernel/build/include/config/auto.conf
> $ ls /media/data_nvme/git/kernel/build/include/generated/autoconf.h
> /media/data_nvme/git/kernel/build/include/generated/autoconf.h
>
> i also tried adding KERNEL_DIR var, but also without success
>
> sudo make ARCH=$ARCH KERNEL_DIR=$KBUILD_OUTPUT INSTALL_MOD_PATH=/media/$USER/BPI-ROOT/ modules_install


This is no variable like KERNEL_DIR.

"git grep KERNEL_DIR" obviously has no hit
in the kernel directory.


> $KBUILD_OUTPUT is definitely set to right directory (checked on beginning of my function)
>
> this message seems to be triggered by Makefile in root (here i tried to add the KBUILD_OUTPUT in the test before include without success)
>
>  718 include/config/auto.conf:
>  719     $(Q)test -e include/generated/autoconf.h -a -e $@ || (      \
>  720     echo >&2;                           \
>  721     echo >&2 "  ERROR: Kernel configuration is invalid.";       \
>  722     echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
>
> any idea?
>
> regards Frank
>


-- 
Best Regards
Masahiro Yamada