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 <arnd@xxxxxxxx> --- 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