kbuild: error out on missing MODULE_LICENSE

Adrian Bunk suggested a build time check for
missing MODULE_LICENSE annotation in modules.
The build time check is fatal as we really
want this fixed for all modules.
In-tree modules should all have been fixed up by now.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Adrian Bunk <bunk@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 110cf243fa4e..843f6fa517cc 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1552,6 +1552,10 @@ static void read_symbols(char *modname)
         }
 
         license = get_modinfo(info.modinfo, info.modinfo_len, "license");
+        if (!license && !is_vmlinux(modname))
+                fatal("modpost: missing MODULE_LICENSE() in %s\n"
+                      "see include/linux/module.h for "
+                      "more information\n", modname);
         while (license) {
                 if (license_is_gpl_compatible(license))
                         mod->gpl_compatible = 1;