linux-kernel - [PATCH v5 00/30] Fix DYNAMIC

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Message-ID: <20251009175834.1024308-1-jim.cromie@gmail.com>
Date: Thu,  9 Oct 2025 11:58:04 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: jbaron@...mai.com
Cc: gregkh@...uxfoundation.org,
	ukaszb@...omium.org,
	louis.chauvet@...tlin.com,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	amd-gfx@...ts.freedesktop.org,
	intel-gvt-dev@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	daniel.vetter@...ll.ch,
	tvrtko.ursulin@...ux.intel.com,
	jani.nikula@...el.com,
	ville.syrjala@...ux.intel.com,
	Jim Cromie <jim.cromie@...il.com>,
	andrewjballance@...il.com
Subject: [PATCH v5 00/30] Fix DYNAMIC_DEBUG classmaps for DRM

DYNAMIC_DEBUG classmaps is BROKEN for its 1st user: DRM. Lets Fix it.

The DECLARE_DYNDBG_CLASSMAP macro muddled the distinction between
definition and reference; in use it failed K&R define once, refer many.

Replace it with:
. DYNAMIC_DEBUG_CLASSMAP_DEFINE		for drm.ko
. DYNAMIC_DEBUG_CLASSMAP_USE		for drivers etc

Enhance test-dynamic-debug{,-submod}.ko to recapitulate DRM's 2+ module
boss-workers failure scenario, and to selftest against them.  This allows
dropping the DRM patches, formerly included to prove functionality.

The latest (unversioned) rev:
. I inexplicably fiddled with the patch subject
. dropped DRM as OT for lib/
https://lore.kernel.org/lkml/20250911213823.374806-1-jim.cromie@gmail.com/

v1-4 saw significant review, thanks Louis Chauvet <louis.chauvet@...tlin.com>

v4: https://lore.kernel.org/lkml/20250803035816.603405-1-jim.cromie@gmail.com/
v3: https://lore.kernel.org/lkml/20250402174156.1246171-1-jim.cromie@gmail.com/#t
v2: https://lore.kernel.org/lkml/20250320185238.447458-1-jim.cromie@gmail.com/
v1: https://lore.kernel.org/lkml/20250125064619.8305-1-jim.cromie@gmail.com/
v0: prehistoric versions are linked from v1,v2

Jim Cromie (30):
  docs/dyndbg: update examples \012 to \n
  docs/dyndbg: explain flags parse 1st
  test-dyndbg: fixup CLASSMAP usage error
  dyndbg: reword "class unknown," to "class:_UNKNOWN_"
  dyndbg: make ddebug_class_param union members same size
  dyndbg: drop NUM_TYPE_ARRAY
  dyndbg: tweak pr_fmt to avoid expansion conflicts
  dyndbg: reduce verbose/debug clutter
  dyndbg: refactor param_set_dyndbg_classes and below
  dyndbg: tighten fn-sig of ddebug_apply_class_bitmap
  dyndbg: replace classmap list with a vector
  dyndbg: macrofy a 2-index for-loop pattern
  dyndbg: DECLARE_DYNDBG_CLASSMAP needs stub defn
  dyndbg,module: make proper substructs in _ddebug_info
  dyndbg: hoist classmap-filter-by-modname up to ddebug_add_module
  dyndbg: move mod_name from ddebug_table down to _ddebug_info
  dyndbg-API: remove DD_CLASS_TYPE_(DISJOINT|LEVEL)_NAMES and code
  selftests-dyndbg: add a dynamic_debug run_tests target
  dyndbg: change __dynamic_func_call_cls* macros into expressions
  dyndbg-API: replace DECLARE_DYNDBG_CLASSMAP
  dyndbg: detect class_id reservation conflicts
  dyndbg: check DYNAMIC_DEBUG_CLASSMAP_DEFINE args at compile-time
  dyndbg-test: change do_prints testpoint to accept a loopct
  dyndbg-API: promote DYNAMIC_DEBUG_CLASSMAP_PARAM to API
  dyndbg: treat comma as a token separator
  dyndbg: split multi-query strings with %
  selftests-dyndbg: add test_mod_submod
  dyndbg: resolve "protection" of class'd pr_debugs
  dyndbg: add DYNAMIC_DEBUG_CLASSMAP_USE_(clname,_base)
  docs/dyndbg: add classmap info to howto

CC: Louis Chauvet <louis.chauvet@...tlin.com>
Cc: ukaszb@...omium.org
cc: andrewjballance@...il.com

 .../admin-guide/dynamic-debug-howto.rst       | 179 ++++-
 MAINTAINERS                                   |   3 +-
 include/asm-generic/vmlinux.lds.h             |   5 +-
 include/linux/dynamic_debug.h                 | 304 ++++++--
 kernel/module/main.c                          |  15 +-
 lib/Kconfig.debug                             |  24 +-
 lib/Makefile                                  |   5 +
 lib/dynamic_debug.c                           | 678 +++++++++++-------
 lib/test_dynamic_debug.c                      | 198 +++--
 lib/test_dynamic_debug_submod.c               |  21 +
 tools/testing/selftests/Makefile              |   1 +
 .../testing/selftests/dynamic_debug/Makefile  |   9 +
 tools/testing/selftests/dynamic_debug/config  |   7 +
 .../dynamic_debug/dyndbg_selftest.sh          | 373 ++++++++++
 14 files changed, 1393 insertions(+), 429 deletions(-)
 create mode 100644 lib/test_dynamic_debug_submod.c
 create mode 100644 tools/testing/selftests/dynamic_debug/Makefile
 create mode 100644 tools/testing/selftests/dynamic_debug/config
 create mode 100755 tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh

-- 
2.51.0