Le 20/03/2025 à 19:51, Jim Cromie a écrit :
The body of ddebug_attach_module_classes() is dominated by a
code-block that finds the contiguous subrange of classmaps matching on
modname, and saves it into the ddebug_table's info record.
Implement this block in a macro to accommodate different component
vectors in the "box" (as named in the for_subvec macro).
And hoist its invocation out of ddebug_attach_module_classes() up into
ddebug_add_module(). This moves the filtering step up closer to
dynamic_debug_init(), which effectively does the same for builtin
pr_debug descriptors; segmenting them into subranges by modname.
Signed-off-by: Jim Cromie <jim.cro...@gmail.com>
>
---
lib/dynamic_debug.c | 57 ++++++++++++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 22 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index f7ec2365ab40..192783ff7b98 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1242,30 +1242,34 @@ static const struct proc_ops proc_fops = {
static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug_info *di)
{
- struct ddebug_class_map *cm;
- int i, nc = 0;
-
- /*
- * Find this module's classmaps in a subrange/wholerange of
- * the builtin/modular classmap vector/section. Save the start
- * and length of the subrange at its edges.
- */
- for_subvec(i, cm, di, maps) {
- if (!strcmp(cm->mod_name, dt->mod_name)) {
- if (!nc) {
- v2pr_info("start subrange, class[%d]: module:%s
base:%d len:%d ty:%d\n",
- i, cm->mod_name, cm->base, cm->length,
cm->map_type);
- dt->info.maps.start = cm;
- }
- nc++;
- }
- }
- if (nc) {
- dt->info.maps.len = nc;
- vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
- }
+ vpr_info("module:%s attached %d classes\n", dt->mod_name,
dt->info.maps.len);
}
+/*
+ * scan the named array: @_vec, ref'd from inside @_box, for the
+ * start,len of the sub-array of elements matching on ->mod_name;
+ * remember them in _dst. Macro depends upon the fields being in both
+ * _box and _dst.
+ * @_i: caller provided counter var, init'd by macro
+ * @_sp: cursor into @_vec.
+ * @_box: ptr to a struct with @_vec, num__##@_vec, mod_name fields.
+ * @_vec: name of ref into array[T] of builtin/modular __section data.
+ * @_dst: ptr to struct with @_vec and num__##@_vec fields, both updated.
I think you forgot to update this documentation with the new vector
structure (num__##@_vec does not exists anymore)
+ */
+#define dd_mark_vector_subrange(_i, _dst, _sp, _box, _vec) ({ \
+ int nc = 0; \
+ for_subvec(_i, _sp, _box, _vec) { \
+ if (!strcmp((_sp)->mod_name, (_dst)->mod_name)) { \
+ if (!nc++) \
+ (_dst)->info._vec.start = (_sp); \
+ } else { \
+ if (nc) \
+ break; /* end of consecutive matches */ \
+ } \
+ } \
+ (_dst)->info._vec.len = nc; \
+})
+
/*
* Allocate a new ddebug_table for the given module
* and add it to the global list.
@@ -1273,6 +1277,8 @@ static void ddebug_attach_module_classes(struct
ddebug_table *dt, struct _ddebug
static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
{
struct ddebug_table *dt;
+ struct ddebug_class_map *cm;
+ int i;
if (!di->descs.len)
return 0;
@@ -1294,6 +1300,13 @@ static int ddebug_add_module(struct _ddebug_info *di,
const char *modname)
dt->info = *di;
INIT_LIST_HEAD(&dt->link);
+ /*
+ * for builtin modules, ddebug_init() insures that the di
+ * cursor marks just the module's descriptors, but it doesn't
+ * do so for the builtin class _maps & _users. find the
Nitpick, the _users builtin class is only introduced in patch 19/56,
maybe update the documentation there.
+ * start,len of the vectors by mod_name, save to dt.
+ */
+ dd_mark_vector_subrange(i, dt, cm, di, maps);
if (di->maps.len)
ddebug_attach_module_classes(dt, di);
--
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
