linux-kernel - Re: [PATCH v3 0/5] gendwarfksyms: Add more kABI rules

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Message-ID: <CAK7LNATt2hgPZyp_MP8DN=vYJ_TuvUQjU-U33ekbeVsLosE5uQ@mail.gmail.com>
Date: Fri, 9 May 2025 08:42:18 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>, 
	Daniel Gomez <da.gomez@...sung.com>, linux-modules@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] gendwarfksyms: Add more kABI rules

On Thu, May 8, 2025 at 8:14 AM Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> Hi,
>
> While looking deeper into the genksyms hacks that have been
> needed during Android's 5.10 and 5.15 GKI lifecycles so far,
> we found a few instances that are not covered by the existing
> gendwarfksyms kABI stability rules. The first case involved
> appending new members to a partially opaque data structure, and
> the second case completely changing opaque types due to a large
> backport that was necessary for both stability and security.
>
> These patches add rules that allow distribution maintainers
> to deal with structure size changes, and as a last resort, to
> completely override a type string used for version calculation.

Applied to linux-kbuild.
Thanks.


> Sami
>
> ---
>
> v3:
> - Added a patch to drop documentation section numbers based
>   on Masahiro's suggestion.
>
> v2: https://lore.kernel.org/r/20250505212401.3379699-6-samitolvanen@google.com/
> - Cleaned up type string parsing based on Petr's feedback.
>
> v1: https://lore.kernel.org/r/20250430214049.2658716-6-samitolvanen@google.com/
>
> ---
>
> Sami Tolvanen (5):
>   gendwarfksyms: Clean up kABI rule look-ups
>   gendwarfksyms: Add a kABI rule to override byte_size attributes
>   gendwarfksyms: Add a kABI rule to override type strings
>   Documentation/kbuild: Drop section numbers
>   Documentation/kbuild: Add new gendwarfksyms kABI rules
>
>  Documentation/kbuild/gendwarfksyms.rst   | 141 +++++++++++++++++-----
>  scripts/gendwarfksyms/dwarf.c            |  14 ++-
>  scripts/gendwarfksyms/examples/kabi.h    |  21 +++-
>  scripts/gendwarfksyms/examples/kabi_ex.c |   7 ++
>  scripts/gendwarfksyms/examples/kabi_ex.h | 101 +++++++++++++++-
>  scripts/gendwarfksyms/gendwarfksyms.h    |   2 +
>  scripts/gendwarfksyms/kabi.c             | 143 ++++++++++++++---------
>  scripts/gendwarfksyms/types.c            | 140 +++++++++++++++++++---
>  8 files changed, 470 insertions(+), 99 deletions(-)
>
>
> base-commit: 92a09c47464d040866cf2b4cd052bc60555185fb
> --
> 2.49.0.987.g0cc8ee98dc-goog
>
>


-- 
Best Regards
Masahiro Yamada