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SubjectRe: [PATCH] modpost: allow modpost to fail on warnings
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Thanks for the review,

>> Set KBUILD_MODPOST_FAIL_ON_WARNINGS to a non-empty value to make the
>> kbuild fail when modpost generates any warnings. This will avoid
>> misses such as [1] where the SOF CI did not catch a missing module
>> license.
>>
>> This was initially contributed in 2016 [2], rebase/clean-ups and tests
>> by Pierre Bossart.
>>
>> Test example:
>> $ KBUILD_MODPOST_FAIL_ON_WARNINGS=1 make
>> GEN Makefile
>> DESCEND objtool
>> CALL sof-dev/scripts/atomic/check-atomics.sh
>> CALL sof-dev/scripts/checksyscalls.sh
>> CHK include/generated/compile.h
>> MODPOST Module.symvers
>> Kernel: arch/x86/boot/bzImage is ready (#13)
>> WARNING: modpost: missing MODULE_LICENSE() in sound/soc/intel/boards/snd-soc-sof-sdw.o
>> make[2]: *** [sof-dev/scripts/Makefile.modpost:114: Module.symvers] Error 2
>
>
> I think [1] should be an error instead of a warning
> by default.

would the following patch be what you have in mind?

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 422f1cfca289..ae1eb67aa0f2 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -2018,7 +2018,7 @@ static void read_symbols(const char *modname)
if (!mod->is_vmlinux) {
license = get_modinfo(&info, "license");
if (!license)
- warn("missing MODULE_LICENSE() in %s\n", modname);
+ error("missing MODULE_LICENSE() in %s\n", modname);
while (license) {
if (license_is_gpl_compatible(license))
mod->gpl_compatible = 1;

If yes, also wondering if we can still add the option to treat warnings
as errors as an opt-in behavior?

Thanks!
-Pierre

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