linux_kselftest-kunit-6.9-rc1

This KUnit next update for Linux 6.9-rc1 consists of:

-- fix to make kunit_bus_type const

-- kunit tool change to Print UML command

-- DRM device creation helpers are now using the new kunit device
   creation helpers. This change resulted in DRM helpers switching
   from using a platform_device, to a dedicated bus and device type
   used by kunit. kunit devices don't set DMA mask and this caused
   regression on some drm tests as they can't allocate DMA buffers.
   Fix this problem by setting DMA masks on the kunit device during
   initialization.

-- KUnit has several macros which accept a log message, which can
   contain printf format specifiers. Some of these (the explicit
   log macros) already use the __printf() gcc attribute to ensure
   the format specifiers are valid, but those which could fail the
   test, and hence used __kunit_do_failed_assertion() behind the scenes,
   did not.

   These include: KUNIT_EXPECT_*_MSG(), KUNIT_ASSERT_*_MSG(), and
   KUNIT_FAIL()

   A 9 patch series adds the __printf() attribute, and fixes all of
   the issues uncovered.
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