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From:   Frank Wunderlich <frank-w@public-files.de>
To:     Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        linux-kernel@vger.kernel.org
Subject: [question] KBUILD_OUTPUT and modules install (with
 INSTALL_MOD_PATH)
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Date:   Mon, 14 Sep 2020 19:57:09 +0200
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Hi,

i try to use modules_install target after building kernel with KBUILD_OUTP=
UT set

KBUILD_OUTPUT: /media/data_nvme/git/kernel/build #kernel source is in /med=
ia/data_nvme/git/kernel/BPI-R2-4.14

kernel is build successfully, but i fail on running the make modules_insta=
ll target

  ERROR: Kernel configuration is invalid.
         include/generated/autoconf.h or include/config/auto.conf are miss=
ing.
         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 pres=
ent

$ 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=3D$ARCH KERNEL_DIR=3D$KBUILD_OUTPUT INSTALL_MOD_PATH=3D/med=
ia/$USER/BPI-ROOT/ modules_install

$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 ad=
d 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