[PATCH v3] init: Do not select DEBUG_KERNEL by default

[Sinan Kaya]

We can't seem to have a kernel with CONFIG_EXPERT set but
CONFIG_DEBUG_KERNEL unset these days.

While some of the features under the CONFIG_EXPERT require
CONFIG_DEBUG_KERNEL, it doesn't apply for all features.

It looks like CONFIG_KALLSYMS_ALL is the only feature that
requires CONFIG_DEBUG_KERNEL.

Select CONFIG_EXPERT when CONFIG_DEBUG_KERNEL is chosen but
you can still choose CONFIG_EXPERT without CONFIG_DEBUG_KERNEL.

Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 init/Kconfig      | 2 --
 lib/Kconfig.debug | 1 +
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 4592bf7997c0..37e10a8391a3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1206,8 +1206,6 @@ config BPF
 
 menuconfig EXPERT
 	bool "Configure standard kernel features (expert users)"
-	# Unhide debug options, to make the on-by-default options visible
-	select DEBUG_KERNEL
 	help
 	  This option allows certain base kernel options and settings
           to be disabled or tweaked. This is for specialized
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 0d9e81779e37..9fbf3499ec8d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -434,6 +434,7 @@ config MAGIC_SYSRQ_SERIAL
 
 config DEBUG_KERNEL
 	bool "Kernel debugging"
+	default EXPERT
 	help
 	  Say Y here if you are developing drivers or trying to debug and
 	  identify kernel problems.
-- 
2.21.0