0864a4e201
Do not mark the kernel text read only if KPROBES is in the kernel; kprobes needs to hot-patch the kernel text to insert it's instrumentation. In this case, only mark the .rodata segment as read only. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Tested-by: S. P. Prasanna <prasanna@in.ibm.com> Cc: Andi Kleen <ak@suse.de> Cc: William Cohen <wcohen@redhat.com> Cc: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
61 lines
2 KiB
Text
61 lines
2 KiB
Text
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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bool
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default y
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source "lib/Kconfig.debug"
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config DEBUG_RODATA
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bool "Write protect kernel read-only data structures"
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depends on DEBUG_KERNEL
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help
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Mark the kernel read-only data as write-protected in the pagetables,
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in order to catch accidental (and incorrect) writes to such const data.
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This option may have a slight performance impact because a portion
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of the kernel code won't be covered by a 2MB TLB anymore.
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If in doubt, say "N".
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config IOMMU_DEBUG
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depends on IOMMU && DEBUG_KERNEL
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bool "Enable IOMMU debugging"
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help
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Force the IOMMU to on even when you have less than 4GB of
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memory and add debugging code. On overflow always panic. And
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allow to enable IOMMU leak tracing. Can be disabled at boot
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time with iommu=noforce. This will also enable scatter gather
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list merging. Currently not recommended for production
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code. When you use it make sure you have a big enough
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IOMMU/AGP aperture. Most of the options enabled by this can
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be set more finegrained using the iommu= command line
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options. See Documentation/x86_64/boot-options.txt for more
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details.
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config IOMMU_LEAK
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bool "IOMMU leak tracing"
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depends on DEBUG_KERNEL
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depends on IOMMU_DEBUG
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help
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Add a simple leak tracer to the IOMMU code. This is useful when you
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are debugging a buggy device driver that leaks IOMMU mappings.
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config DEBUG_STACKOVERFLOW
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL
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help
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This option will cause messages to be printed if free stack space
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drops below a certain limit.
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config DEBUG_STACK_USAGE
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bool "Stack utilization instrumentation"
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depends on DEBUG_KERNEL
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help
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Enables the display of the minimum amount of free stack which each
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task has ever had available in the sysrq-T and sysrq-P debug output.
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This option will slow down process creation somewhat.
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#config X86_REMOTE_DEBUG
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# bool "kgdb debugging stub"
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endmenu
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