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-rw-r--r--scripts/mod/modpost.c94
1 files changed, 68 insertions, 26 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 0dd16177642..dfde0e87a76 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -24,7 +24,10 @@ static int all_versions = 0;
/* If we are modposting external module set to 1 */
static int external_module = 0;
/* How a symbol is exported */
-enum export {export_plain, export_gpl, export_gpl_future, export_unknown};
+enum export {
+ export_plain, export_unused, export_gpl,
+ export_unused_gpl, export_gpl_future, export_unknown
+};
void fatal(const char *fmt, ...)
{
@@ -191,7 +194,9 @@ static struct {
enum export export;
} export_list[] = {
{ .str = "EXPORT_SYMBOL", .export = export_plain },
+ { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
{ .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
+ { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
{ .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
{ .str = "(unknown)", .export = export_unknown },
};
@@ -205,6 +210,8 @@ static const char *export_str(enum export ex)
static enum export export_no(const char * s)
{
int i;
+ if (!s)
+ return export_unknown;
for (i = 0; export_list[i].export != export_unknown; i++) {
if (strcmp(export_list[i].str, s) == 0)
return export_list[i].export;
@@ -216,8 +223,12 @@ static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
{
if (sec == elf->export_sec)
return export_plain;
+ else if (sec == elf->export_unused_sec)
+ return export_unused;
else if (sec == elf->export_gpl_sec)
return export_gpl;
+ else if (sec == elf->export_unused_gpl_sec)
+ return export_unused_gpl;
else if (sec == elf->export_gpl_future_sec)
return export_gpl_future;
else
@@ -366,8 +377,12 @@ static void parse_elf(struct elf_info *info, const char *filename)
info->modinfo_len = sechdrs[i].sh_size;
} else if (strcmp(secname, "__ksymtab") == 0)
info->export_sec = i;
+ else if (strcmp(secname, "__ksymtab_unused") == 0)
+ info->export_unused_sec = i;
else if (strcmp(secname, "__ksymtab_gpl") == 0)
info->export_gpl_sec = i;
+ else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
+ info->export_unused_gpl_sec = i;
else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
info->export_gpl_future_sec = i;
@@ -1085,38 +1100,64 @@ void buf_write(struct buffer *buf, const char *s, int len)
buf->pos += len;
}
-void check_license(struct module *mod)
+static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
+{
+ const char *e = is_vmlinux(m) ?"":".ko";
+
+ switch (exp) {
+ case export_gpl:
+ fatal("modpost: GPL-incompatible module %s%s "
+ "uses GPL-only symbol '%s'\n", m, e, s);
+ break;
+ case export_unused_gpl:
+ fatal("modpost: GPL-incompatible module %s%s "
+ "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
+ break;
+ case export_gpl_future:
+ warn("modpost: GPL-incompatible module %s%s "
+ "uses future GPL-only symbol '%s'\n", m, e, s);
+ break;
+ case export_plain:
+ case export_unused:
+ case export_unknown:
+ /* ignore */
+ break;
+ }
+}
+
+static void check_for_unused(enum export exp, const char* m, const char* s)
+{
+ const char *e = is_vmlinux(m) ?"":".ko";
+
+ switch (exp) {
+ case export_unused:
+ case export_unused_gpl:
+ warn("modpost: module %s%s "
+ "uses symbol '%s' marked UNUSED\n", m, e, s);
+ break;
+ default:
+ /* ignore */
+ break;
+ }
+}
+
+static void check_exports(struct module *mod)
{
struct symbol *s, *exp;
for (s = mod->unres; s; s = s->next) {
const char *basename;
- if (mod->gpl_compatible == 1) {
- /* GPL-compatible modules may use all symbols */
- continue;
- }
exp = find_symbol(s->name);
if (!exp || exp->module == mod)
continue;
basename = strrchr(mod->name, '/');
if (basename)
basename++;
- switch (exp->export) {
- case export_gpl:
- fatal("modpost: GPL-incompatible module %s "
- "uses GPL-only symbol '%s'\n",
- basename ? basename : mod->name,
- exp->name);
- break;
- case export_gpl_future:
- warn("modpost: GPL-incompatible module %s "
- "uses future GPL-only symbol '%s'\n",
- basename ? basename : mod->name,
- exp->name);
- break;
- case export_plain: /* ignore */ break;
- case export_unknown: /* ignore */ break;
- }
+ else
+ basename = mod->name;
+ if (!mod->gpl_compatible)
+ check_for_gpl_usage(exp->export, basename, exp->name);
+ check_for_unused(exp->export, basename, exp->name);
}
}
@@ -1271,7 +1312,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
}
/* parse Module.symvers file. line format:
- * 0x12345678<tab>symbol<tab>module[<tab>export]
+ * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
**/
static void read_dump(const char *fname, unsigned int kernel)
{
@@ -1284,7 +1325,7 @@ static void read_dump(const char *fname, unsigned int kernel)
return;
while ((line = get_next_line(&pos, file, size))) {
- char *symname, *modname, *d, *export;
+ char *symname, *modname, *d, *export, *end;
unsigned int crc;
struct module *mod;
struct symbol *s;
@@ -1297,7 +1338,8 @@ static void read_dump(const char *fname, unsigned int kernel)
*modname++ = '\0';
if ((export = strchr(modname, '\t')) != NULL)
*export++ = '\0';
-
+ if (export && ((end = strchr(export, '\t')) != NULL))
+ *end = '\0';
crc = strtoul(line, &d, 16);
if (*symname == '\0' || *modname == '\0' || *d != '\0')
goto fail;
@@ -1396,7 +1438,7 @@ int main(int argc, char **argv)
for (mod = modules; mod; mod = mod->next) {
if (mod->skip)
continue;
- check_license(mod);
+ check_exports(mod);
}
for (mod = modules; mod; mod = mod->next) {