script: modpost: emit a warning when the description is missing

Emit a warning when the mod description is missed and only
when the W=1 is enabled.

Reported-by: Roland Kletzing <devzero@web.de>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=10770
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Tested-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/mod/modpost.c

@@ -1720,6 +1720,8 @@ static void read_symbols(const char *modname)
 		}
 	}
 
+	if (extra_warn && !get_modinfo(&info, "description"))
+		warn("missing MODULE_DESCRIPTION() in %s\n", modname);
 	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
 		symname = remove_dot(info.strtab + sym->st_name);