linux-kernel - Re: [PATCH v2 0/3] selftests/hid: fix building for older kernels

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Date:   Tue, 26 Sep 2023 16:26:45 +0900
From:   Justin Stitt <justinstitt@...gle.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Eduard Zingerman <eddyz87@...il.com>, linux-input@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Benjamin Tissoires <bentiss@...nel.org>
Subject: Re: [PATCH v2 0/3] selftests/hid: fix building for older kernels

Hey all,

Gentle ping on this patch. Looking to get this patch and [1] slated
for 6.7 wherein we can start getting cleaner kselftests builds.

I do not think I am able to successfully run the hid/bpf selftests due
to my kernel version being too low (and an inability to upgrade it as
I'm on a corp rolling release). I'd appreciate some insight on how to
get the tests running or if someone could actually build+run the tests
with this patch applied.

On Sat, Sep 9, 2023 at 7:22 AM Justin Stitt <justinstitt@...gle.com> wrote:
>
> Hi, I am sending this series on behalf of myself and Benjamin Tissoires. There
> existed an initial n=3 patch series which was later expanded to n=4 and
> is now back to n=3 with some fixes added in and rebased against
> mainline.
>
> This patch series aims to ensure that the hid/bpf selftests can be built
> without errors.
>
> Here's Benjamin's initial cover letter for context:
> |  These fixes have been triggered by [0]:
> |  basically, if you do not recompile the kernel first, and are
> |  running on an old kernel, vmlinux.h doesn't have the required
> |  symbols and the compilation fails.
> |
> |  The tests will fail if you run them on that very same machine,
> |  of course, but the binary should compile.
> |
> |  And while I was sorting out why it was failing, I realized I
> |  could do a couple of improvements on the Makefile.
> |
> |  [0] https://lore.kernel.org/linux-input/56ba8125-2c6f-a9c9-d498-0ca1c153dcb2@redhat.com/T/#t
>
> Changes from v1 -> v2:
> - roll Justin's fix into patch 1/3
> - add __attribute__((preserve_access_index)) (thanks Eduard)
> - rebased onto mainline (2dde18cd1d8fac735875f2e4987f11817cc0bc2c)
> - Link to v1: https://lore.kernel.org/all/20230825-wip-selftests-v1-0-c862769020a8@kernel.org/
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1698
> Link: https://github.com/ClangBuiltLinux/continuous-integration2/issues/61
> ---
> Benjamin Tissoires (3):
>       selftests/hid: ensure we can compile the tests on kernels pre-6.3
>       selftests/hid: do not manually call headers_install
>       selftests/hid: force using our compiled libbpf headers
>
>  tools/testing/selftests/hid/Makefile               | 10 ++---
>  tools/testing/selftests/hid/progs/hid.c            |  3 --
>  .../testing/selftests/hid/progs/hid_bpf_helpers.h  | 49 ++++++++++++++++++++++
>  3 files changed, 53 insertions(+), 9 deletions(-)
> ---
> base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c
> change-id: 20230908-kselftest-09-08-56d7f4a8d5c4
>
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>

[1]: https://lore.kernel.org/all/20230912-kselftest-param_test-c-v1-1-80a6cffc7374@google.com/

Thanks
Justin