x86: unification of i386 and x86_64 Kconfig.debug

Adding proper dependencies so the two Kconfig.debug files
are now identical and move the result file to x86.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 119 insertions, 0 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
new file mode 100644
index 000000000000..970b2defe7df
--- /dev/null
+++ b/arch/x86/Kconfig.debug
@@ -0,0 +1,119 @@
+menu "Kernel hacking"
+
+config TRACE_IRQFLAGS_SUPPORT
+	def_bool y
+
+source "lib/Kconfig.debug"
+
+config EARLY_PRINTK
+	bool "Early printk" if EMBEDDED && DEBUG_KERNEL
+	default y
+	depends on X86_32
+	help
+	  Write kernel log output directly into the VGA buffer or to a serial
+	  port.
+
+	  This is useful for kernel debugging when your machine crashes very
+	  early before the console code is initialized. For normal operation
+	  it is not recommended because it looks ugly and doesn't cooperate
+	  with klogd/syslogd or the X server. You should normally N here,
+	  unless you want to debug such a crash.
+
+config DEBUG_STACKOVERFLOW
+	bool "Check for stack overflows"
+	depends on DEBUG_KERNEL
+	help
+	  This option will cause messages to be printed if free stack space
+	  drops below a certain limit.
+
+config DEBUG_STACK_USAGE
+	bool "Stack utilization instrumentation"
+	depends on DEBUG_KERNEL
+	help
+	  Enables the display of the minimum amount of free 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.
+
+comment "Page alloc debug is incompatible with Software Suspend on i386"
+	depends on DEBUG_KERNEL && HIBERNATION
+	depends on X86_32
+
+config DEBUG_PAGEALLOC
+	bool "Debug page memory allocations"
+	depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS
+	depends on 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_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 4KSTACKS
+	bool "Use 4Kb for kernel stacks instead of 8Kb"
+	depends on DEBUG_KERNEL
+	depends on X86_32
+	help
+	  If you say Y here the kernel will use a 4Kb stacksize for the
+	  kernel stack attached to each process/thread. This facilitates
+	  running more threads on a system and also reduces the pressure
+	  on the VM subsystem for higher order allocations. This option
+	  will also use IRQ stacks to compensate for the reduced stackspace.
+
+config X86_FIND_SMP_CONFIG
+	def_bool y
+	depends on X86_LOCAL_APIC || X86_VOYAGER
+	depends on X86_32
+
+config X86_MPPARSE
+	def_bool y
+	depends on X86_LOCAL_APIC && !X86_VISWS
+	depends on X86_32
+
+config DOUBLEFAULT
+	default y
+	bool "Enable doublefault exception handler" if EMBEDDED
+	depends on X86_32
+	help
+	  This option allows trapping of rare doublefault exceptions that
+	  would otherwise cause a system to silently reboot. Disabling this
+	  option saves about 4k and might cause you much additional grey
+	  hair.
+
+config IOMMU_DEBUG
+	bool "Enable IOMMU debugging"
+	depends on IOMMU && DEBUG_KERNEL
+	depends on X86_64
+	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