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

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Message-ID: <20250507231403.377725-7-samitolvanen@google.com>
Date: Wed,  7 May 2025 23:14:04 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
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, 
	Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v3 0/5] gendwarfksyms: Add more kABI rules

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.

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