linux-kernel - Re: [PATCH bpf-next v5 1/3] btf: allow mmap of vmlinux btf

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Message-ID: <CAN+4W8hsK6FMBon0-J6mAYk1yVsamYL=cHqFkj3syepxiv16Ug@mail.gmail.com>
Date: Thu, 17 Jul 2025 14:17:46 +0100
From: Lorenz Bauer <lmb@...valent.com>
To: Breno Leitao <leitao@...ian.org>
Cc: linux-arm-kernel@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>, 
	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>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, Alan Maguire <alan.maguire@...cle.com>
Subject: Re: [PATCH bpf-next v5 1/3] btf: allow mmap of vmlinux btf

Hi Breno,

Thanks for reaching out.

On Thu, Jul 17, 2025 at 1:39 PM Breno Leitao <leitao@...ian.org> wrote:

> Should __pa_symbol() be used instead of virt_to_phys()?

I'm not really well versed with mm in general. Looking around a bit I
found some explanation in [1]. Your suggested fix does make sense to
me based on that.

Let me run the patch against bpf-ci and see what happens.

1: https://lore.kernel.org/all/90667b2b7f773308318261f96ebefd1a67133c4c.1732464395.git.lukas@wunner.de/

Lorenz