modpost: show warning if vmlinux is not found when processing modules

check_exports() does not print warnings about unresolved symbols if vmlinux is missing because there would be too many. This situation happens when you do 'make modules' from the clean tree, or compile external modules against a kernel tree that has not been completely built. It is dangerous to not check unresolved symbols because you might be building useless modules. At least it should be warned. Signed-off-by: Masahiro Yamada <[email protected]>
majek · Jun 6, 2020 · 7e8a323 · 7e8a323
1 parent 436b2ac
commit 7e8a323
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
@@ -2001,8 +2001,6 @@ static void read_symbols(const char *modname)
 
 	mod = new_module(modname);
 
-	/* When there's no vmlinux, don't print warnings about
-	 * unresolved symbols (since there'll be too many ;) */
 	if (is_vmlinux(modname)) {
 		have_vmlinux = 1;
 		mod->skip = 1;
@@ -2623,6 +2621,13 @@ int main(int argc, char **argv)
 	if (files_source)
 		read_symbols_from_files(files_source);
 
+	/*
+	 * When there's no vmlinux, don't print warnings about
+	 * unresolved symbols (since there'll be too many ;)
+	 */
+	if (!have_vmlinux)
+		warn("Symbol info of vmlinux is missing. Unresolved symbol check will be entirely skipped.\n");
+
 	err = 0;
 
 	for (mod = modules; mod; mod = mod->next) {