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modpost: Allow extended modversions without basic MODVERSIONS

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If you know that your kernel modules will only ever be loaded by a newer
kernel, you can disable BASIC_MODVERSIONS to save space. This also
allows easy creation of test modules to see how tooling will respond to
modules that only have the new format.

Signed-off-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Matthew Maurer 2025-01-03 17:37:03 +00:00 committed by Masahiro Yamada
parent fc7d5e3210
commit e8639b7ef0
3 changed files with 23 additions and 2 deletions
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15
kernel/module/Kconfig
View File

@ -217,6 +217,21 @@ config EXTENDED_MODVERSIONS
The most likely reason you would enable this is to enable Rust
support. If unsure, say N.
config BASIC_MODVERSIONS
bool "Basic Module Versioning Support"
depends on MODVERSIONS
default y
help
This enables basic MODVERSIONS support, allowing older tools or
kernels to potentially load modules.
Disabling this may cause older `modprobe` or `kmod` to be unable
to read MODVERSIONS information from built modules. With this
disabled, older kernels may treat this module as unversioned.
This is enabled by default when MODVERSIONS are enabled.
If unsure, say Y.
config MODULE_SRCVERSION_ALL
bool "Source checksum for all modules"
help

1
scripts/Makefile.modpost
View File

@ -43,6 +43,7 @@ MODPOST = $(objtree)/scripts/mod/modpost
modpost-args = \
$(if $(CONFIG_MODULES),-M) \
$(if $(CONFIG_MODVERSIONS),-m) \
$(if $(CONFIG_BASIC_MODVERSIONS),-b) \
$(if $(CONFIG_EXTENDED_MODVERSIONS),-x) \
$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \

9
scripts/mod/modpost.c
View File

@ -33,6 +33,8 @@ static bool module_enabled;
static bool modversions;
/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
static bool all_versions;
/* Is CONFIG_BASIC_MODVERSIONS set? */
static bool basic_modversions;
/* Is CONFIG_EXTENDED_MODVERSIONS set? */
static bool extended_modversions;
/* If we are modposting external module set to 1 */
@ -1857,7 +1859,7 @@ static void add_versions(struct buffer *b, struct module *mod)
{
struct symbol *s;
if (!modversions)
if (!basic_modversions)
return;
buf_printf(b, "\n");
@ -2177,7 +2179,7 @@ int main(int argc, char **argv)
LIST_HEAD(dump_lists);
struct dump_list *dl, *dl2;
while ((opt = getopt(argc, argv, "ei:MmnT:to:au:WwENd:x")) != -1) {
while ((opt = getopt(argc, argv, "ei:MmnT:to:au:WwENd:xb")) != -1) {
switch (opt) {
case 'e':
external_module = true;
@ -2226,6 +2228,9 @@ int main(int argc, char **argv)
case 'd':
missing_namespace_deps = optarg;
break;
case 'b':
basic_modversions = true;
break;
case 'x':
extended_modversions = true;
break;