arch/x86_64/Kconfig.debug

menu "Kernel hacking"

source "lib/Kconfig.debug"

config DEBUG_RODATA
       bool "Write protect kernel read-only data structures"
       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".

config IOMMU_DEBUG
       depends on GART_IOMMU && DEBUG_KERNEL
       bool "Enable IOMMU debugging"
       help
         Force the IOMMU to on even when you have less than 4GB of
	 memory and add debugging code. On overflow always panic. And
	 allow to enable IOMMU leak tracing. Can be disabled at boot
	 time with iommu=noforce. This will also enable scatter gather
	 list merging.  Currently not recommended for production
	 code. When you use it make sure you have a big enough
	 IOMMU/AGP aperture.  Most of the options enabled by this can
	 be set more finegrained using the iommu= command line
	 options. See Documentation/x86_64/boot-options.txt for more
	 details.

config IOMMU_LEAK
       bool "IOMMU leak tracing"
       depends on DEBUG_KERNEL
       depends on IOMMU_DEBUG
       help
         Add a simple leak tracer to the IOMMU code. This is useful when you
	 are debugging a buggy device driver that leaks IOMMU mappings.

#config X86_REMOTE_DEBUG
#       bool "kgdb debugging stub"

endmenu