source "lib/Kconfig.debug"
config EARLY_PRINTK
- bool "Early printk" if EMBEDDED && DEBUG_KERNEL && X86_32
+ bool "Early printk" if EMBEDDED
default y
help
Write kernel log output directly into the VGA buffer or to a serial
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
- depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS
- depends on X86_32
+ depends on DEBUG_KERNEL && X86_32
help
Unmap pages from the kernel linear mapping after free_pages().
This results in a large slowdown, but helps to find certain types
of memory corruptions.
+config DEBUG_PER_CPU_MAPS
+ bool "Debug access to per_cpu maps"
+ depends on DEBUG_KERNEL
+ depends on X86_64_SMP
+ default n
+ help
+ Say Y to verify that the per_cpu map being accessed has
+ been setup. Adds a fair amount of code to kernel memory
+ and decreases performance.
+
+ Say N if unsure.
+
config DEBUG_RODATA
bool "Write protect kernel read-only data structures"
+ default y
depends on DEBUG_KERNEL
help
Mark the kernel read-only data as write-protected in the pagetables,
in order to catch accidental (and incorrect) writes to such const
- data. This option may have a slight performance impact because a
- portion of the kernel code won't be covered by a 2MB TLB anymore.
- If in doubt, say "N".
+ data. This is recommended so that we can catch kernel bugs sooner.
+ If in doubt, say "Y".
+
+config DEBUG_RODATA_TEST
+ bool "Testcase for the DEBUG_RODATA feature"
+ depends on DEBUG_RODATA
+ help
+ This option enables a testcase for the DEBUG_RODATA
+ feature as well as for the change_page_attr() infrastructure.
+ If in doubt, say "N"
+
+config DEBUG_NX_TEST
+ tristate "Testcase for the NX non-executable stack feature"
+ depends on DEBUG_KERNEL && m
+ help
+ This option enables a testcase for the CPU NX capability
+ and the software setup of this feature.
+ If in doubt, say "N"
config 4KSTACKS
bool "Use 4Kb for kernel stacks instead of 8Kb"
help
This option will cause struct boot_params to be exported via debugfs.
+config CPA_DEBUG
+ bool "CPA self-test code"
+ depends on DEBUG_KERNEL
+ help
+ Do change_page_attr() self-tests every 30 seconds.
+
endmenu