linux/linux-5.18.11/arch/s390/Kconfig.debug

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# SPDX-License-Identifier: GPL-2.0
config EARLY_PRINTK
def_bool y
config DEBUG_ENTRY
bool "Debug low-level entry code"
depends on DEBUG_KERNEL
help
This option enables sanity checks in s390 low-level entry code.
Some of these sanity checks may slow down kernel entries and
exits or otherwise impact performance.
If unsure, say N.
config CIO_INJECT
bool "CIO Inject interfaces"
depends on DEBUG_KERNEL && DEBUG_FS
help
This option provides a debugging facility to inject certain artificial events
and instruction responses to the CIO layer of Linux kernel. The newly created
debugfs user-interfaces will be at /sys/kernel/debug/s390/cio/*