linux-kernel - [PATCH v4 04/14] modpost: add sym_find_with

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Message-Id: <20220508190631.2386038-5-masahiroy@kernel.org>
Date:   Mon,  9 May 2022 04:06:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-modules@...r.kernel.org, linux-s390@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, clang-built-linux@...glegroups.com,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v4 04/14] modpost: add sym_find_with_module() helper

find_symbol() returns the first symbol found in the hash table. This
table is global, so it may return a symbol from an unexpected module.

There is a case where we want to search for a symbol with a given name
in a specified module.

Add sym_find_with_module(), which receives the module pointer as the
second argument. It is equivalent to find_module() if NULL is passed
as the module pointer.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
Tested-by: Nathan Chancellor <nathan@...nel.org>
---

Changes in v4:
  - Only takes the new helper from
    https://patchwork.kernel.org/project/linux-kbuild/patch/20220505072244.1155033-2-masahiroy@kernel.org/

Changes in v2:
  - Rename the new func to sym_find_with_module()

 scripts/mod/modpost.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index e7e2c70a98f5..fc5db1f73cf1 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -266,7 +266,7 @@ static void sym_add_unresolved(const char *name, struct module *mod, bool weak)
 	list_add_tail(&sym->list, &mod->unresolved_symbols);
 }
 
-static struct symbol *find_symbol(const char *name)
+static struct symbol *sym_find_with_module(const char *name, struct module *mod)
 {
 	struct symbol *s;
 
@@ -275,12 +275,17 @@ static struct symbol *find_symbol(const char *name)
 		name++;
 
 	for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
-		if (strcmp(s->name, name) == 0)
+		if (strcmp(s->name, name) == 0 && (!mod || s->module == mod))
 			return s;
 	}
 	return NULL;
 }
 
+static struct symbol *find_symbol(const char *name)
+{
+	return sym_find_with_module(name, NULL);
+}
+
 struct namespace_list {
 	struct list_head list;
 	char namespace[];
-- 
2.32.0