linux-kernel - Re: [PATCH bpf-next] kbuild, bpf: Enable reproducible BTF generation

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Message-ID: <698e7023-7725-4904-ba35-6b32955a3c40@t-8ch.de>
Date: Wed, 22 Jan 2025 19:51:20 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, 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>, 
	Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Kui-Feng Lee <kuifeng@...com>, 
	Alan Maguire <alan.maguire@...cle.com>, Martin Rodriguez Reboredo <yakoyoku@...il.com>, 
	Miguel Ojeda <ojeda@...nel.org>
Cc: bpf@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] kbuild, bpf: Enable reproducible BTF generation

On 2024-12-11 00:23:50+0100, Thomas Weißschuh wrote:
> Pahole v1.27 added a new BTF generation feature to support
> reproducibility in the face of multithreading.
> Enable it if supported and reproducible builds are requested.
> 
> As unknown --btf_features are ignored, avoid the test for the pahole
> version to keep the line readable.

Since pahole v1.29 this patch is obsolete. From [0]:

BTF encoder:

- The parallel reproducible BTF generation done using the new DWARF loader
  multithreading model is as fast as the old non-reproducible one and thus is
  now always performed, making the "reproducible_build" flag moot.


[0] https://lore.kernel.org/lkml/Z4-TDt42dTKZvCo6@x1/