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menu "Kernel hacking"
config TRACE_IRQFLAGS_SUPPORT
def_bool y
config DEBUG_VERBOSE
bool "Verbose fault messages"
default y
select PRINTK
help
When a program crashes due to an exception, or the kernel detects
an internal error, the kernel can print a not so brief message
explaining what the problem was. This debugging information is
useful to developers and kernel hackers when tracking down problems,
but mostly meaningless to other people. This is always helpful for
debugging but serves no purpose on a production system.
Most people should say N here.
config PROTECT_KERNEL
default y
bool 'Enable Kernel range register Protection'
help
Adds code to enable/disable range registers to protect static
kernel code/data from userspace. Currently the ranges covered
do no protect kernel loadable modules or dynamically allocated
kernel data.
config NO_KERNEL_MSG
bool "Suppress Kernel BUG Messages"
help
Do not output any debug BUG messages within the kernel.
config EARLY_PRINTK
bool "Use the driver that you selected as console also for early printk (to debug kernel bootup)."
default n
help
If you want to use the serdes driver (console=ttyUS0) for
early printk, you must also supply an additional kernel boot
parameter like this:
serdes=ioportaddr,irq,clockrate,baud
For an IP7160RGW eval board, you could use this:
serdes=0x2004000,61,250000000,57600
which will let you see early printk output at 57600 baud.
config STOP_ON_TRAP
bool "Enable stopping at the LDSR for all traps"
default n
help
Cause the LDSR to stop all threads whenever a trap is about to be serviced
config STOP_ON_BUG
bool "Enable stopping on failed BUG_ON()"
default n
help
Cause all BUG_ON failures to stop all threads
config DEBUG_IRQMEASURE
bool "Enable IRQ handler measurements"
default n
help
When enabled each IRQ's min/avg/max times will be printed. If the handler
re-enables interrupt, the times will show the full time including to service
nested interrupts. See /proc/irq_measurements.
config DEBUG_PCIMEASURE
bool "Enable PCI transaction measurements"
default n
help
When enabled the system will measure the min/avg/max timer for each PCI transactions.
See /proc/pci_measurements.
config ACCESS_OK_CHECKS_ENABLED
bool "Enable user space access checks"
default n
help
Enabling this check causes the kernel to verify that addresses passed
to the kernel by the user space code are within the processes
address space. On a no-mmu system, this is done by examining the
processes memory data structures (adversly affecting performance) but
ensuring that a process does not ask the kernel to violate another
processes address space. Sadly, the kernel uses access_ok() for
address that are in the kernel which results in a large volume of
false positives.
choice
prompt "Unaligned Access Support"
default UNALIGNED_ACCESS_ENABLED
help
Kernel / Userspace unaligned access handling.
config UNALIGNED_ACCESS_ENABLED
bool "Kernel and Userspace"
help
config UNALIGNED_ACCESS_USERSPACE_ONLY
bool "Userspace Only"
help
config UNALIGNED_ACCESS_DISABLED
bool "Disabled"
help
endchoice
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
default n
depends on DEBUG_KERNEL
help
This option will cause messages to be printed if free kernel stack space
drops below a certain limit (THREAD_SIZE /8).
config DEBUG_STACK_USAGE
bool "Stack utilization instrumentation"
default n
depends on DEBUG_KERNEL
help
Enables the display of the minimum amount of free kernel stack which each
task has ever had available in the sysrq-T and sysrq-P debug output.
This option will slow down process creation somewhat.
source "lib/Kconfig.debug"
endmenu
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