netdev - Re: [PATCH bpf-next v2 03/10] selftests/bpf: Disable feature-llvm for vmtest

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Message-ID: <fc9a03f1809cfdd80a9a8cb7b513e32302be5a43.camel@gmail.com>
Date: Wed, 04 Sep 2024 12:37:33 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Pu Lehui <pulehui@...weicloud.com>, bpf@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, netdev@...r.kernel.org
Cc: Andrii Nakryiko <andrii@...nel.org>, Mykola Lysenko <mykolal@...com>, 
 Björn Töpel <bjorn@...nel.org>, Puranjay Mohan
 <puranjay@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Pu Lehui
 <pulehui@...wei.com>
Subject: Re: [PATCH bpf-next v2 03/10] selftests/bpf: Disable feature-llvm
 for vmtest

On Wed, 2024-09-04 at 14:19 +0000, Pu Lehui wrote:
> From: Pu Lehui <pulehui@...wei.com>
> 
> After commit b991fc520700 ("selftests/bpf: utility function to get
> program disassembly after jit"), Makefile will link libLLVM* related
> libraries to the user binary execution file when detecting that
> feature-llvm is enabled, which will cause the local vmtest to appear as
> follows mistake:
> 
>   ./test_progs: error while loading shared libraries: libLLVM-17.so.1:
>     cannot open shared object file: No such file or directory
> 
> Considering that the get_jited_program_text() function is a useful tool
> for user debugging and will not be relied upon by the entire bpf
> selftests, let's turn it off in local vmtest.
> 
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---

I actually don't agree.
The __jited tag is supposed to be used by selftests
(granted, used by a single selftest for now).
Maybe add an option to forgo LLVM linkage when test_progs are compiled?
Regarding base image lacking libLLVM -- I need to fix this.