linux-kernel - Re: [PATCH] rust: add basic ELF sections parser

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Message-Id: <DA9AS88BCFX2.FET64FP3J2WO@nvidia.com>
Date: Fri, 30 May 2025 15:56:37 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Greg KH" <gregkh@...uxfoundation.org>
Cc: "Danilo Krummrich" <dakr@...nel.org>, "Timur Tabi" <timur@...nel.org>,
 "John Hubbard" <jhubbard@...dia.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>, "Alice Ryhl"
 <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH] rust: add basic ELF sections parser

On Fri May 30, 2025 at 3:21 PM JST, Greg KH wrote:
> On Fri, May 30, 2025 at 09:58:02AM +0900, Alexandre Courbot wrote:
>> > But for now, doing it in generic code, that all systems end up loading,
>> > yet very very very few would ever actually use makes no sense.  And
>> > adding it to a driver also doesn't make sense as you can define your
>> > user/kernel api now, it's not set in stone at all given that there is no
>> > existing code merged.
>> 
>> Eschewing this from the driver would require duplicating the GSP
>> firmware (a healthy 26MB compressed binary) in linux-firmware to provide
>> both ELF and non-ELF versions of the same code, and also store the other
>> ELF sections as their own files. I expect this to be a hard sell for
>> linux-firmware.
>
> Why would the linux-firmware people care about the size of firmware
> blobs being given to them?  That's the whole reason for their existance,
> to put them in one place instead of having to download them from random
> locations on the internet, or to have them in the kernel tree itself.
>
> It's already 300MB or so for the whole project, what's 26MB more?

Roughtly 1/10th of the current total size as avoidable overhead. ^_^;