[PATCH v2 0/5] dyndbg: fix i386 alignment and KEEP module sections

[Jim Cromie <jim.cromie@gmail.com>]

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. refactors BOUNDED_SECTION_* macros for later reuse
   v2- adds note that macros are for vmlinux.lds.h only, not for modules.

2. drops unused HEADERED_SECTION_* macros

3. fixes ALIGN(8) omission causing NULL ptr on i386
   adds,uses BOUNDED_SECTION _ALIGNED variants

4. removes now redundant ALIGN(8)s in vmlinux.lds.h

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

v2:

- avoids BOUNDED_SECTION in modules.  Since ELF sections have well
  defined bounaries, _start & _end symbols are useless, and empty
  sections are unhelpful, possibly confusing to tools.

- sets 0 address to the sections, not just whatever current is.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
Changes in v2:
- EDITME: describe what is new in this series revision.
- EDITME: use bulletpoints and terse descriptions.
- Link to v1: https://lore.kernel.org/r/20260502-asm-generic-1-v1-0-1103ee0152df@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: 6d35786de28116ecf78797a62b84e6bf3c45aa5a
change-id: 20260502-asm-generic-1-32c842a35dd0

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