The vprintk_emit() function is not available when CONFIG_PRINTK
is disabled:

kunit/test.c:22:9: error: implicit declaration of function 'vprintk_emit' 
[-Werror,-Wimplicit-function-declaration]

I suppose without printk(), there is not much use in kunit
either, so add a Kconfig depenedency here.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 kunit/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kunit/Kconfig b/kunit/Kconfig
index 8541ef95b65a..e80d8af00454 100644
--- a/kunit/Kconfig
+++ b/kunit/Kconfig
@@ -6,6 +6,7 @@ menu "KUnit support"
 
 config KUNIT
        bool "Enable support for unit tests (KUnit)"
+       depends on PRINTK
        help
          Enables support for kernel unit tests (KUnit), a lightweight unit
          testing and mocking framework for the Linux kernel. These tests are
-- 
2.20.0

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