linux-kernel - Re: [PATCH] selftests: lib.mk: fix out-of-tree builds

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Message-ID: <e05c4897-ea77-bd1e-0bdd-e897107a614f@redhat.com>
Date:   Tue, 13 Jun 2023 10:44:10 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Anders Roxell <anders.roxell@...aro.org>, shuah@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list : MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests: lib.mk: fix out-of-tree builds

On 13.06.23 10:16, Muhammad Usama Anjum wrote:
> This patch needs to go through mm tree as the commit which it fixes is in mm.
> 
> On 6/13/23 12:49 PM, Anders Roxell wrote:
>> Since commit ("selftests: error out if kernel header files are not yet
>> built") got merged, the kselftest build correctly because the
>> KBUILD_OUTPUT isn't set when building out-of-tree and specifying 'O='
>> This is the error message that pops up.
>>
>> make --silent --keep-going --jobs=32 O=/home/anders/.cache/tuxmake/builds/1482/build INSTALL_PATH=/home/anders/.cache/tuxmake/builds/1482/build/kselftest_install ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- V=1 CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- kselftest-install
>> make[3]: Entering directory '/home/anders/src/kernel/next/tools/testing/selftests/alsa'
>>
>> -e .[1;31merror.[0m: missing kernel header files.
>> Please run this and try again:
>>
>>      cd /home/anders/src/kernel/next/tools/testing/selftests/../../..
>>      make headers
>>
>> make[3]: Leaving directory '/home/anders/src/kernel/next/tools/testing/selftests/alsa'
>> make[3]: *** [../lib.mk:77: kernel_header_files] Error 1
>>
>> Fixing the issue by assigning KBUILD_OUTPUT the same way how its done in
>> kselftest's Makefile. By adding 'KBUILD_OUTPUT := $(O)' 'if $(origin O)'
>> is set to 'command line'. This will set the the BUILD dir to
>> KBUILD_OUTPUT/kselftest when doing out-of-tree builds which makes them
>> in its own separete output directory.
>>
>> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> Please add fixes tag. ("selftests: error out if kernel header files are not
> yet built")
> 
> Tested-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

This should get squashed into the original patch unless it's already in 
mm-stable (which it isn't) and we have a stable commit id.

-- 
Cheers,

David / dhildenb