linux-kernel - Re: [PATCH] rust: Disallow BTF generation with Rust + LTO

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Message-ID: <Z3_5eGD_F1_ZxfqE@x1>
Date: Thu, 9 Jan 2025 13:29:44 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Tamir Duberstein <tamird@...il.com>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Neal Gompa <neal@...pa.dev>,
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Matthew Maurer <mmaurer@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	Matthias Maennich <maennich@...gle.com>, bpf <bpf@...r.kernel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Eric Curtin <ecurtin@...hat.com>,
	Martin Reboredo <yakoyoku@...il.com>,
	Alessandro Decina <alessandro.d@...il.com>,
	Michal Rostecki <vadorovsky@...tonmail.com>,
	Dave Tucker <dave@...cker.co.uk>
Subject: Re: [PATCH] rust: Disallow BTF generation with Rust + LTO

On Thu, Jan 09, 2025 at 10:49:49AM -0500, Tamir Duberstein wrote:
> On Thu, Jan 9, 2025 at 10:47 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> > I was thinking about it after reading this thread yesterday, i.e. we
> > could encode constructs from Rust that can be represented in BTF and
> > skip the ones that can't, pruning types that depend on non BTF
> > representable types, etc.
 
> Yep, this is what bpf-linker does, along with some other things[0]. I
> highly recommend reading the code I linked to avoid re-discovering
> these things.

Sure, thanks for pointing it out and suggest I read it while
experimenting with having the same concept in pahole, I'll try a quick
hack and then look at it to see how close I got to what you guys came up
with :-)

- Arnaldo
 
> [0] https://github.com/aya-rs/bpf-linker/commit/1007ec7fed03562eb7d08f3e7521094a7e698b95