Re: [PATCH v4 2/2] rust: time: add Delta::to_jiffies_timeout() for timeout conversion

[FUJITA Tomonori <tomo@flapping.org>]

On Fri, 25 Sep 2026 10:00:19 +0200
Andreas Hindborg <a.hindborg@kernel.org> wrote:

>> diff --git a/rust/kernel/Kconfig.test b/rust/kernel/Kconfig.test
>> index e6a5c7a795f0..0087749995d2 100644
>> --- a/rust/kernel/Kconfig.test
>> +++ b/rust/kernel/Kconfig.test
>> @@ -83,4 +83,14 @@ config RUST_BITFIELD_KUNIT_TEST
>>
>>  	  If unsure, say N.
>>
>> +config RUST_TIME_KUNIT_TEST
>> +	bool "KUnit tests for the Rust time API" if !KUNIT_ALL_TESTS
>> +	default KUNIT_ALL_TESTS
>> +	help
>> +	  This option enables KUnit tests for the Rust time API.
>> +	  These are only for development and testing, not for regular
>> +	  kernel use cases.
>> +
>> +	  If unsure, say N.
> 
> Why would you gate out the tests? They do not look like they take long
> to run or anything.

Documentation/rust/testing.rst says:

  Each test suite should be guarded by a Kconfig option in
  ``rust/kernel/Kconfig.test``.

I think that the reason is the kernel image size. From commit
e74b7a3f5aee ("rust: tests: add Kconfig for KUnit test"):

  All the tests are compiled unconditionally now, which adds ~200 kB to
  the kernel image for me on x86_64. As Rust matures, this bloating will
  inevitably grow.