Commit c53ddacd authored by Kirill Korotaev's avatar Kirill Korotaev Committed by Sam Ravnborg
Browse files

kbuild: fail kernel compilation in case of unresolved module symbols 



At stage 2 modpost utility is used to check modules.  In case of unresolved
symbols modpost only prints warning.

IMHO it is a good idea to fail compilation process in case of unresolved
symbols (at least in modules coming with kernel), since usually such errors
are left unnoticed, but kernel modules are broken.

- new option '-w' is added to modpost:
  if option is specified, modpost only warns about unresolved symbols

- modpost is called with '-w' for external modules in Makefile.modpost

Signed-off-by: default avatarAndrey Mirkin <amirkin@sw.ru>
Signed-off-by: default avatarKirill Korotaev <dev@openvz.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 22126929

scripts/Makefile.modpost

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules 
	$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \

	$(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \

	$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \

	$(if $(KBUILD_EXTMOD),-w) \

	$(wildcard vmlinux) $(filter-out FORCE,$^)



PHONY += __modpost

scripts/mod/modpost.c

+19 −6
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ int have_vmlinux = 0; 
static int all_versions = 0;

/* If we are modposting external module set to 1 */

static int external_module = 0;

/* Only warn about unresolved symbols */

static int warn_unresolved = 0;

/* How a symbol is exported */

enum export {

	export_plain,      export_unused,     export_gpl,
@@ -1196,16 +1198,19 @@ static void add_header(struct buffer *b, struct module *mod) 
/**

 * Record CRCs for unresolved symbols

 **/

static void add_versions(struct buffer *b, struct module *mod)

static int add_versions(struct buffer *b, struct module *mod)

{

	struct symbol *s, *exp;

	int err = 0;



	for (s = mod->unres; s; s = s->next) {

		exp = find_symbol(s->name);

		if (!exp || exp->module == mod) {

			if (have_vmlinux && !s->weak)

			if (have_vmlinux && !s->weak) {

				warn("\"%s\" [%s.ko] undefined!\n",

				     s->name, mod->name);

				err = warn_unresolved ? 0 : 1;

			}

			continue;

		}

		s->module = exp->module;
@@ -1214,7 +1219,7 @@ static void add_versions(struct buffer *b, struct module *mod) 
	}



	if (!modversions)

		return;

		return err;



	buf_printf(b, "\n");

	buf_printf(b, "static const struct modversion_info ____versions[]\n");
@@ -1234,6 +1239,8 @@ static void add_versions(struct buffer *b, struct module *mod) 
	}



	buf_printf(b, "};\n");



	return err;

}



static void add_depends(struct buffer *b, struct module *mod,
@@ -1411,8 +1418,9 @@ int main(int argc, char **argv) 
	char *kernel_read = NULL, *module_read = NULL;

	char *dump_write = NULL;

	int opt;

	int err;



	while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) {

	while ((opt = getopt(argc, argv, "i:I:mo:aw")) != -1) {

		switch(opt) {

			case 'i':

				kernel_read = optarg;
@@ -1430,6 +1438,9 @@ int main(int argc, char **argv) 
			case 'a':

				all_versions = 1;

				break;

			case 'w':

				warn_unresolved = 1;

				break;

			default:

				exit(1);

		}
@@ -1450,6 +1461,8 @@ int main(int argc, char **argv) 
		check_exports(mod);

	}



	err = 0;



	for (mod = modules; mod; mod = mod->next) {

		if (mod->skip)

			continue;
@@ -1457,7 +1470,7 @@ int main(int argc, char **argv) 
		buf.pos = 0;



		add_header(&buf, mod);

		add_versions(&buf, mod);

		err |= add_versions(&buf, mod);

		add_depends(&buf, mod, modules);

		add_moddevtable(&buf, mod);

		add_srcversion(&buf, mod);
@@ -1469,5 +1482,5 @@ int main(int argc, char **argv) 
	if (dump_write)

		write_dump(dump_write);



	return 0;

	return err;

}

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