[PATCH 02/29] modpost: do not call get_modinfo() for vmlinux

Masahiro Yamada
2020-05-17T09:49:36Z

The three calls of get_modinfo() ("license", "import_ns", "version")
always return NULL for vmlinux because the built-in module info is
prefixed with __MODULE_INFO_PREFIX.

It is harmless to call get_modinfo(), but there is no point to search
for what apparently does not exist.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

scripts/mod/modpost.c | 45 +++++++++++++++++++++++--------------------
1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 77e5425759e2..af098d7efc22 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -2014,25 +2014,26 @@ static void read_symbols(const char *modname)
mod->skip = 1;
}

- license = get_modinfo(&info, "license");
- if (!license && !is_vmlinux(modname))
- warn("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;
- else {
- mod->gpl_compatible = 0;
- break;
+ if (!is_vmlinux(modname)) {
+ license = get_modinfo(&info, "license");
+ if (!license)
+ warn("missing MODULE_LICENSE() in %s\n", modname);
+ while (license) {
+ if (license_is_gpl_compatible(license))
+ mod->gpl_compatible = 1;
+ else {
+ mod->gpl_compatible = 0;
+ break;
+ }
+ license = get_next_modinfo(&info, "license", license);
}
- license = get_next_modinfo(&info, "license", license);
- }

- namespace = get_modinfo(&info, "import_ns");
- while (namespace) {
- add_namespace(&mod->imported_namespaces, namespace);
- namespace = get_next_modinfo(&info, "import_ns", namespace);
+ namespace = get_modinfo(&info, "import_ns");
+ while (namespace) {
+ add_namespace(&mod->imported_namespaces, namespace);
+ namespace = get_next_modinfo(&info, "import_ns",
+ namespace);
+ }
}

for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
@@ -2073,10 +2074,12 @@ static void read_symbols(const char *modname)
if (!is_vmlinux(modname) || vmlinux_section_warnings)
check_sec_ref(mod, modname, &info);

- version = get_modinfo(&info, "version");
- if (version || (all_versions && !is_vmlinux(modname)))
- get_src_version(modname, mod->srcversion,
- sizeof(mod->srcversion)-1);
+ if (!is_vmlinux(modname)) {
+ version = get_modinfo(&info, "version");
+ if (version || all_versions)
+ get_src_version(modname, mod->srcversion,
+ sizeof(mod->srcversion) - 1);
+ }

parse_elf_finish(&info);

--
2.25.1