linux-kernel - Re: [PATCH v6 1/5] export_report: Rehabilitate script

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Message-ID: <CABCJKudqG+8-MdxXRfdu7pYe=UniiiAV1P4QnbP2c1R3Q8DC=Q@mail.gmail.com>
Date: Wed, 16 Oct 2024 17:29:21 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Matthew Maurer <mmaurer@...gle.com>
Cc: masahiroy@...nel.org, ndesaulniers@...gle.com, ojeda@...nel.org, 
	gary@...yguo.net, mcgrof@...nel.org, Alex Gaynor <alex.gaynor@...il.com>, 
	rust-for-linux@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, neal@...pa.dev, marcan@...can.st, j@...nau.net, 
	asahi@...ts.linux.dev, linux-modules@...r.kernel.org, 
	Boqun Feng <boqun.feng@...il.com>, 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>
Subject: Re: [PATCH v6 1/5] export_report: Rehabilitate script

Hi,

On Tue, Oct 15, 2024 at 4:19 PM Matthew Maurer <mmaurer@...gle.com> wrote:
>
> The `export_report.pl` script was broken [1] a while back due to a code
> cleanup causing the regex to no longer match. Additionally, it assumes a
> `modules.order` file containing `.ko` in a build directory with `.mod.c`
> files. I cannot find when this would have been the case in the history,
> as normally `.ko` files only appear in `modules.order` in installed
> modules directories, and those do not contain `.mod.c` files.
> This patch makes it able to report symbol usage counts for a build tree
> with modules and MODVERSIONS.
>
> Since the rest of this series will change the format of `.mod.c`, this
> change fixes the script to work correctly against a current build tree.
> Given that the regex no longer matches the format used in `.mod.c`, it
> cannot have worked since 2019, so updating this script is purely out of
> an abundance of caution. I am unsure who uses this script or for what
> purpose.
>
> * modules.order in a build directory uses .o, not .ko files. Allow .o
>   files when parsing modules.order.
> * The .mod.c format changed [1] how it expressed the section attribute,
>   leading to a regex mismatch. Update it to match modpost.c
>
> [1]: https://lore.kernel.org/all/20190909113423.2289-2-yamada.masahiro@socionext.com/

If this script has been broken for half a decade and nobody noticed,
does anyone actually use it? If this is dead code, I would prefer to
just delete it.

Sami