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From: Jim Cromie <jim.cromie@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>, Jason Baron <jbaron@akamai.com>,
	 Luis Chamberlain <mcgrof@kernel.org>,
	Petr Pavlu <petr.pavlu@suse.com>,
	 Daniel Gomez <da.gomez@kernel.org>,
	Sami Tolvanen <samitolvanen@google.com>,
	 Aaron Tomlin <atomlin@atomlin.com>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-modules@vger.kernel.org, Jim Cromie <jim.cromie@gmail.com>,
	 Louis Chauvet <louis.chauvet@bootlin.com>
Subject: [PATCH 0/5] PATCH 0/6] dyndbg: fix i386 alignment and KEEP module sections
Date: Sat, 02 May 2026 18:05:31 -0600	[thread overview]
Message-ID: <20260502-asm-generic-1-v1-0-1103ee0152df@gmail.com> (raw)

This series starts with a fix to a section misalignement on i386, and
follows with cleanups and refactoring for reuse.

When CONFIG_DRM_USE_DYNAMIC_DEBUG=Y (currently marked BROKEN) and
CONFIG_DRM=y, the __dyndbg_classes section gets a single
struct/record.  On i386 this is 28-bytes, breaking the required
ALIGN(8) on the following __dyndbg section.

This breaks dynamic_debug_init() with a NULL pointer dereference; the
section traversal logic encounters padding bytes instead of a valid
descriptor.

the series:

1. adds ALIGN(8) to the BOUNDED_SECTION_* macros

2. refactors BOUNDED_SECTION_* macros for later reuse

3. adds dyndbg.lds.S to KEEP sections in modules
   follows codetag.lds.h model

4. drops unused HEADERED_SECTION_* macros

5. removes redundant (after patch 1) ALIGN(8)s in vmlinux.lds.h

6. adds BOUNDED_SECTION_* _ALIGN variants,
   usea them in ORC_UNWIND_TABLE

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
Jim Cromie (5):
      vmlinux.lds.h: refactor BOUNDED_SECTION_* macros into bounded_sections.lds.h
      vmlinux.lds.h: drop unused HEADERED_SECTION* macros
      vmlinux.lds.h: Fix ALIGN(8) omission causing NULL ptr on i386
      vmlinux.lds.h: remove redundant ALIGN(8) directives
      dyndbg.lds.S: fix lost dyndbg sections in modules

 MAINTAINERS                                |  1 +
 include/asm-generic/bounded_sections.lds.h | 32 +++++++++++++++++
 include/asm-generic/dyndbg.lds.h           | 19 ++++++++++
 include/asm-generic/vmlinux.lds.h          | 58 +++++-------------------------
 scripts/module.lds.S                       |  2 ++
 5 files changed, 62 insertions(+), 50 deletions(-)
---
base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
change-id: 20260502-asm-generic-1-32c842a35dd0

Best regards,
-- 
Jim Cromie <jim.cromie@gmail.com>


             reply	other threads:[~2026-05-03  0:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-03  0:05 Jim Cromie [this message]
2026-05-03  0:05 ` [PATCH 1/5] vmlinux.lds.h: refactor BOUNDED_SECTION_* macros into bounded_sections.lds.h Jim Cromie
2026-05-03  0:05 ` [PATCH 2/5] vmlinux.lds.h: drop unused HEADERED_SECTION* macros Jim Cromie
2026-05-03  0:05 ` [PATCH 3/5] vmlinux.lds.h: Fix ALIGN(8) omission causing NULL ptr on i386 Jim Cromie
2026-05-03  0:05 ` [PATCH 4/5] vmlinux.lds.h: remove redundant ALIGN(8) directives Jim Cromie
2026-05-03  0:05 ` [PATCH 5/5] dyndbg.lds.S: fix lost dyndbg sections in modules Jim Cromie
2026-05-05  7:26   ` Petr Pavlu

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