[linux-2.6-block.git] / arch / x86_64 / Kconfig.debug

menu "Kernel hacking"

source "lib/Kconfig.debug"

config INIT_DEBUG
	bool "Debug __init statements"
	depends on DEBUG_KERNEL
	help
	  Fill __init and __initdata at the end of boot. This helps debugging
	  illegal uses of __init and __initdata after initialization.

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
Commit	Line	Data
1da177e4 LT	1	menu "Kernel hacking"
	2
	3	source "lib/Kconfig.debug"
	4
1da177e4 LT	5	config INIT_DEBUG
	6	bool "Debug __init statements"
	7	depends on DEBUG_KERNEL
	8	help
	9	Fill __init and __initdata at the end of boot. This helps debugging
	10	illegal uses of __init and __initdata after initialization.
	11
67df197b AV	12	config DEBUG_RODATA
	13	bool "Write protect kernel read-only data structures"
	14	depends on DEBUG_KERNEL
	15	help
	16	Mark the kernel read-only data as write-protected in the pagetables,
	17	in order to catch accidental (and incorrect) writes to such const data.
	18	This option may have a slight performance impact because a portion
	19	of the kernel code won't be covered by a 2MB TLB anymore.
	20	If in doubt, say "N".
	21
1da177e4 LT	22	config IOMMU_DEBUG
	23	depends on GART_IOMMU && DEBUG_KERNEL
	24	bool "Enable IOMMU debugging"
	25	help
	26	Force the IOMMU to on even when you have less than 4GB of
	27	memory and add debugging code. On overflow always panic. And
	28	allow to enable IOMMU leak tracing. Can be disabled at boot
	29	time with iommu=noforce. This will also enable scatter gather
	30	list merging. Currently not recommended for production
	31	code. When you use it make sure you have a big enough
	32	IOMMU/AGP aperture. Most of the options enabled by this can
	33	be set more finegrained using the iommu= command line
	34	options. See Documentation/x86_64/boot-options.txt for more
	35	details.
	36
1da177e4 LT	37	config IOMMU_LEAK
	38	bool "IOMMU leak tracing"
	39	depends on DEBUG_KERNEL
	40	depends on IOMMU_DEBUG
	41	help
	42	Add a simple leak tracer to the IOMMU code. This is useful when you
	43	are debugging a buggy device driver that leaks IOMMU mappings.
	44
	45	#config X86_REMOTE_DEBUG
	46	# bool "kgdb debugging stub"
	47
	48	endmenu