Files
Masahiro Yamada 8d9cc7f159 Rename .data.once to .data..once to fix resetting WARN*_ONCE
[ Upstream commit dbefa1f31a ]

Commit b1fca27d38 ("kernel debug: support resetting WARN*_ONCE")
added support for clearing the state of once warnings. However,
it is not functional when CONFIG_LD_DEAD_CODE_DATA_ELIMINATION or
CONFIG_LTO_CLANG is enabled, because .data.once matches the
.data.[0-9a-zA-Z_]* pattern in the DATA_MAIN macro.

Commit cb87481ee8 ("kbuild: linker script do not match C names unless
LD_DEAD_CODE_DATA_ELIMINATION is configured") was introduced to suppress
the issue for the default CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=n case,
providing a minimal fix for stable backporting. We were aware this did
not address the issue for CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y. The
plan was to apply correct fixes and then revert cb87481ee8. [1]

Seven years have passed since then, yet the #ifdef workaround remains in
place. Meanwhile, commit b1fca27d38 introduced the .data.once section,
and commit dc5723b02e ("kbuild: add support for Clang LTO") extended
the #ifdef.

Using a ".." separator in the section name fixes the issue for
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION and CONFIG_LTO_CLANG.

[1]: https://lore.kernel.org/linux-kbuild/CAK7LNASck6BfdLnESxXUeECYL26yUDm0cwRZuM4gmaWUkxjL5g@mail.gmail.com/

Fixes: b1fca27d38 ("kernel debug: support resetting WARN*_ONCE")
Fixes: dc5723b02e ("kbuild: add support for Clang LTO")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-12-05 13:54:31 +01:00
..
2024-06-05 10:18:06 +01:00
2024-05-14 20:21:04 +02:00
2024-03-05 11:21:18 -08:00
2024-07-09 11:31:32 +02:00
2024-01-02 12:41:16 +00:00
2024-06-25 11:10:18 +02:00
2022-08-09 22:14:02 -07:00
2024-05-08 10:35:09 +01:00
2024-03-05 19:21:17 -08:00
2023-11-02 09:31:02 +01:00
2024-05-07 01:35:55 +02:00
2021-10-15 11:33:08 +01:00
2024-02-28 11:19:41 +00:00
2023-04-22 01:39:41 +02:00
2024-10-04 16:38:50 +02:00
2021-10-13 09:40:46 -07:00
2024-07-02 18:59:33 -07:00
2024-04-25 15:24:23 -07:00
2024-04-01 10:49:28 +01:00
2023-07-14 20:39:30 -07:00
2024-04-30 18:32:38 -07:00
2024-05-30 18:29:38 -07:00
2024-05-30 18:29:38 -07:00
2023-10-04 11:49:20 -07:00
2024-06-12 06:39:04 +01:00
2024-07-08 14:07:31 -07:00
2024-05-09 20:25:55 -07:00
2023-07-28 14:07:59 -07:00
2022-12-12 15:04:39 -08:00
2024-04-07 02:42:36 -04:00
2023-09-14 16:16:36 +02:00
2023-12-14 16:38:59 +01:00