linux-kernel - Re: [PATCH v8 1/3] modules: Support extended MODVERSIONS info

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Message-ID: <CAGSQo02H_RwtLpdt4E_LWKjzGvryY_7s20e4QhhA5B7N0LPxVA@mail.gmail.com>
Date: Wed, 30 Oct 2024 22:06:12 -0700
From: Matthew Maurer <mmaurer@...gle.com>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, Naveen N Rao <naveen@...nel.org>, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, Petr Pavlu <petr.pavlu@...e.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Daniel Gomez <da.gomez@...sung.com>, 
	Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, 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>, linuxppc-dev@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v8 1/3] modules: Support extended MODVERSIONS info

On Wed, Oct 30, 2024 at 9:37 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> On Thu, Oct 31, 2024 at 12:22:36PM +1100, Michael Ellerman wrote:
> > Matthew Maurer <mmaurer@...gle.com> writes:
> > > Adds a new format for MODVERSIONS which stores each field in a separate
> > > ELF section. This initially adds support for variable length names, but
> > > could later be used to add additional fields to MODVERSIONS in a
> > > backwards compatible way if needed. Any new fields will be ignored by
> > > old user tooling, unlike the current format where user tooling cannot
> > > tolerate adjustments to the format (for example making the name field
> > > longer).
> > >
> > > Since PPC munges its version records to strip leading dots, we reproduce
> > > the munging for the new format. Other architectures do not appear to
> > > have architecture-specific usage of this information.
> > >
> > > Reviewed-by: Sami Tolvanen <samitolvanen@...gle.com>
> > > Signed-off-by: Matthew Maurer <mmaurer@...gle.com>
> > > ---
> > >  arch/powerpc/kernel/module_64.c | 24 ++++++++++-
> >
> > Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
>
> Michael, Matthew, why make everyone deal with this instead of just
> making this an arch thing and ppc would be the only one doing it?
>
>   Luis
>

I'm not sure I understand - the PPC changes are in an arch-specific
directory, and triggered through the arch-implemented callback
mod_frob_arch_sections. What would you like done to make it more of an
arch-thing?