linux-kernel - [PATCH v8 29/35] dyndbg: add __counted

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Date: Mon, 29 Apr 2024 13:39:15 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: jbaron@...mai.com,
	gregkh@...uxfoundation.org,
	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
Cc: ukaszb@...omium.org,
	linux-doc@...r.kernel.org,
	daniel.vetter@...ll.ch,
	tvrtko.ursulin@...ux.intel.com,
	jani.nikula@...el.com,
	ville.syrjala@...ux.intel.com,
	seanpaul@...omium.org,
	robdclark@...il.com,
	groeck@...gle.com,
	yanivt@...gle.com,
	bleung@...gle.com,
	Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v8 29/35] dyndbg: add __counted_by annotations

Tell the compiler about our vectors (array,length), in 2 places:

h: struct _ddebug_info, which keeps refs to the __dyndbg_* ELF/DATA
sections, these are all vectors with a length.

c: struct ddebug_table, which has sub-refs into _ddebug_info.*

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 include/linux/dynamic_debug.h | 6 +++---
 lib/dynamic_debug.c           | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 090fe9554db7..c54d2a4e1d48 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -146,9 +146,9 @@ struct ddebug_class_user {
 
 /* encapsulate linker provided built-in (or module) dyndbg data */
 struct _ddebug_info {
-	struct _ddebug *descs;
-	struct ddebug_class_map *classes;
-	struct ddebug_class_user *class_users;
+	struct _ddebug *descs __counted_by(num_descs);
+	struct ddebug_class_map *classes __counted_by(num_classes);
+	struct ddebug_class_user *class_users __counted_by(num_class_users);
 	unsigned int num_descs;
 	unsigned int num_classes;
 	unsigned int num_class_users;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 625838bd74aa..390a35508fb6 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -49,9 +49,9 @@ extern struct ddebug_class_user __stop___dyndbg_class_users[];
 struct ddebug_table {
 	struct list_head link;
 	const char *mod_name;
-	struct _ddebug *ddebugs;
-	struct ddebug_class_map *classes;
-	struct ddebug_class_user *class_users;
+	struct _ddebug *ddebugs __counted_by(num_ddebugs);
+	struct ddebug_class_map *classes __counted_by(num_classes);
+	struct ddebug_class_user *class_users __counted_by(num_class_users);
 	unsigned int num_ddebugs, num_classes, num_class_users;
 };
 
-- 
2.44.0