Merge branch 'for_paulus' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc

[pandora-kernel.git] / arch / i386 / Kconfig.debug

diff --git a/arch/i386/Kconfig.debug b/arch/i386/Kconfig.debug
index c48b424..c92191b 100644 (file)
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -31,17 +31,36 @@ config DEBUG_STACK_USAGE
 
          This option will slow down process creation somewhat.
 
+config STACK_BACKTRACE_COLS
+       int "Stack backtraces per line" if DEBUG_KERNEL
+       range 1 3
+       default 2
+       help
+         Selects how many stack backtrace entries per line to display.
+
+         This can save screen space when displaying traces.
+
 comment "Page alloc debug is incompatible with Software Suspend on i386"
        depends on DEBUG_KERNEL && SOFTWARE_SUSPEND
 
 config DEBUG_PAGEALLOC
-       bool "Page alloc debugging"
-       depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND
+       bool "Debug page memory allocations"
+       depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND && !HUGETLBFS
        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
@@ -62,4 +81,13 @@ config X86_MPPARSE
        depends on X86_LOCAL_APIC && !X86_VISWS
        default y
 
+config DOUBLEFAULT
+       default y
+       bool "Enable doublefault exception handler" if EMBEDDED
+       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.
+
 endmenu