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Message-ID: <20250609154926.1237033-2-samitolvanen@google.com>
Date: Mon, 9 Jun 2025 15:49:27 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>,
Daniel Gomez <da.gomez@...sung.com>, linux-modules@...r.kernel.org,
linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
Sami Tolvanen <samitolvanen@...gle.com>, Giuliano Procida <gprocida@...gle.com>
Subject: [PATCH] gendwarfksyms: Fix structure type overrides
As we always iterate through the entire die_map when expanding
type strings, recursively processing referenced types in
type_expand_child() is not actually necessary. Furthermore,
the type_string kABI rule added in commit c9083467f7b9
("gendwarfksyms: Add a kABI rule to override type strings") can
fail to override type strings for structures due to a missing
kabi_get_type_string() check in this function.
Fix the issue by dropping the unnecessary recursion and moving
the override check to type_expand(). Note that symbol versions
are otherwise unchanged with this patch.
Fixes: c9083467f7b9 ("gendwarfksyms: Add a kABI rule to override type strings")
Reported-by: Giuliano Procida <gprocida@...gle.com>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
scripts/gendwarfksyms/types.c | 65 ++++++++++-------------------------
1 file changed, 19 insertions(+), 46 deletions(-)
diff --git a/scripts/gendwarfksyms/types.c b/scripts/gendwarfksyms/types.c
index 39ce1770e463..7bd459ea6c59 100644
--- a/scripts/gendwarfksyms/types.c
+++ b/scripts/gendwarfksyms/types.c
@@ -333,37 +333,11 @@ static void calculate_version(struct version *version,
cache_free(&expansion_cache);
}
-static void __type_expand(struct die *cache, struct type_expansion *type,
- bool recursive);
-
-static void type_expand_child(struct die *cache, struct type_expansion *type,
- bool recursive)
-{
- struct type_expansion child;
- char *name;
-
- name = get_type_name(cache);
- if (!name) {
- __type_expand(cache, type, recursive);
- return;
- }
-
- if (recursive && !__cache_was_expanded(&expansion_cache, cache->addr)) {
- __cache_mark_expanded(&expansion_cache, cache->addr);
- type_expansion_init(&child);
- __type_expand(cache, &child, true);
- type_map_add(name, &child);
- type_expansion_free(&child);
- }
-
- type_expansion_append(type, name, name);
-}
-
-static void __type_expand(struct die *cache, struct type_expansion *type,
- bool recursive)
+static void __type_expand(struct die *cache, struct type_expansion *type)
{
struct die_fragment *df;
struct die *child;
+ char *name;
list_for_each_entry(df, &cache->fragments, list) {
switch (df->type) {
@@ -379,7 +353,12 @@ static void __type_expand(struct die *cache, struct type_expansion *type,
error("unknown child: %" PRIxPTR,
df->data.addr);
- type_expand_child(child, type, recursive);
+ name = get_type_name(child);
+ if (name)
+ type_expansion_append(type, name, name);
+ else
+ __type_expand(child, type);
+
break;
case FRAGMENT_LINEBREAK:
/*
@@ -397,12 +376,17 @@ static void __type_expand(struct die *cache, struct type_expansion *type,
}
}
-static void type_expand(struct die *cache, struct type_expansion *type,
- bool recursive)
+static void type_expand(const char *name, struct die *cache,
+ struct type_expansion *type)
{
+ const char *override;
+
type_expansion_init(type);
- __type_expand(cache, type, recursive);
- cache_free(&expansion_cache);
+
+ if (stable && kabi_get_type_string(name, &override))
+ type_parse(name, override, type);
+ else
+ __type_expand(cache, type);
}
static void type_parse(const char *name, const char *str,
@@ -416,8 +400,6 @@ static void type_parse(const char *name, const char *str,
if (!*str)
error("empty type string override for '%s'", name);
- type_expansion_init(type);
-
for (pos = 0; str[pos]; ++pos) {
bool empty;
char marker = ' ';
@@ -478,7 +460,6 @@ static void type_parse(const char *name, const char *str,
static void expand_type(struct die *cache, void *arg)
{
struct type_expansion type;
- const char *override;
char *name;
if (cache->mapped)
@@ -504,11 +485,7 @@ static void expand_type(struct die *cache, void *arg)
debug("%s", name);
- if (stable && kabi_get_type_string(name, &override))
- type_parse(name, override, &type);
- else
- type_expand(cache, &type, true);
-
+ type_expand(name, cache, &type);
type_map_add(name, &type);
type_expansion_free(&type);
free(name);
@@ -518,7 +495,6 @@ static void expand_symbol(struct symbol *sym, void *arg)
{
struct type_expansion type;
struct version version;
- const char *override;
struct die *cache;
/*
@@ -532,10 +508,7 @@ static void expand_symbol(struct symbol *sym, void *arg)
if (__die_map_get(sym->die_addr, DIE_SYMBOL, &cache))
return; /* We'll warn about missing CRCs later. */
- if (stable && kabi_get_type_string(sym->name, &override))
- type_parse(sym->name, override, &type);
- else
- type_expand(cache, &type, false);
+ type_expand(sym->name, cache, &type);
/* If the symbol already has a version, don't calculate it again. */
if (sym->state != SYMBOL_PROCESSED) {
base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
--
2.50.0.rc0.604.gd4ff7b7c86-goog
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