netdev - Re: [PATCH v3 bpf-next 0/5] Add libbpf support for type- and enum value-based CO-RE relocations

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Message-ID: <20200819215846.frvsnoxu6vv4wamt@ast-mbp.dhcp.thefacebook.com>
Date:   Wed, 19 Aug 2020 14:58:46 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com,
        daniel@...earbox.net, andrii.nakryiko@...il.com, kernel-team@...com
Subject: Re: [PATCH v3 bpf-next 0/5] Add libbpf support for type- and enum
 value-based CO-RE relocations

On Wed, Aug 19, 2020 at 12:45:14PM -0700, Andrii Nakryiko wrote:
> 
> Selftests are added for all the new features. Selftests utilizing new Clang
> built-ins are designed such that they will compile with older Clangs and will
> be skipped during test runs. So this shouldn't cause any build and test
> failures on systems with slightly outdated Clang compiler.
> 
> LLVM patches adding these relocation in Clang:
>   - __builtin_btf_type_id() ([0], [1], [2]);
>   - __builtin_preserve_type_info(), __builtin_preserve_enum_value() ([3], [4]).
> 
>   [0] https://reviews.llvm.org/D74572
>   [1] https://reviews.llvm.org/D74668
>   [2] https://reviews.llvm.org/D85174
>   [3] https://reviews.llvm.org/D83878
>   [4] https://reviews.llvm.org/D83242

Applied.
Thank you for listing the above in the commit log, but please follow up with
corresponding update to README.rst and mention the same details there: the
symptoms of missing clang features, which tests are going to be skipped for
older clang, etc.

Also progs/test_core_reloc_type_id.c talks about some bug with
__builtin_preserve_type_info() please add llvm diff number that fixes
it to that .c file.