fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / i386 / Kconfig.debug

diff --git a/arch/i386/Kconfig.debug b/arch/i386/Kconfig.debug
index ffb6642..b7dc11d 100644 (file)
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -1,9 +1,13 @@
 menu "Kernel hacking"
 
+config TRACE_IRQFLAGS_SUPPORT
+       bool
+       default y
+
 source "lib/Kconfig.debug"
 
 config EARLY_PRINTK
-       bool "Early printk" if EMBEDDED
+       bool "Early printk" if EMBEDDED && DEBUG_KERNEL
        default y
        help
          Write kernel log output directly into the VGA buffer or to a serial
@@ -18,16 +22,9 @@ config EARLY_PRINTK
 config DEBUG_STACKOVERFLOW
        bool "Check for stack overflows"
        depends on DEBUG_KERNEL
-
-config KPROBES
-       bool "Kprobes"
-       depends on DEBUG_KERNEL
        help
-         Kprobes allows you to trap at almost any kernel address and
-         execute a callback function.  register_kprobe() establishes
-         a probepoint and specifies the callback.  Kprobes is useful
-         for kernel debugging, non-intrusive instrumentation and testing.
-         If in doubt, say "N".
+         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"
@@ -38,16 +35,30 @@ config DEBUG_STACK_USAGE
 
          This option will slow down process creation somewhat.
 
+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
+       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
        help
          If you say Y here the kernel will use a 4Kb stacksize for the
          kernel stack attached to each process/thread. This facilitates
@@ -65,4 +76,24 @@ config X86_MPPARSE
        depends on X86_LOCAL_APIC && !X86_VISWS
        default y
 
+config DOUBLEFAULT
+       default y
+       bool "Enable doublefault exception handler" if EMBEDDED
+       depends on !X86_NO_TSS
+       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 DEBUG_PARAVIRT
+       bool "Enable some paravirtualization debugging"
+       default y
+       depends on PARAVIRT && DEBUG_KERNEL
+       help
+         Currently deliberately clobbers regs which are allowed to be
+         clobbered in inlined paravirt hooks, even in native mode.
+         If turning this off solves a problem, then DISABLE_INTERRUPTS() or
+         ENABLE_INTERRUPTS() is lying about what registers can be clobbered.
+
 endmenu