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

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 15b003b..3a3ba7f 100644 (file)
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -926,6 +926,74 @@ config REGPARM
        generate incorrect output with certain kernel constructs when
        -mregparm=3 is used.
 
+config IRQSTACKS
+       bool "Use separate IRQ stacks"
+       help
+       If you say Y here the kernel will use a separate IRQ stack on each
+       cpu to handle interrupts.
+
+config STACK_SIZE_SHIFT
+       int "Kernel stack size (12 => 4KB, 13 => 8KB, 14 => 16KB)"
+       range 12 14
+       default 12 if IRQSTACKS
+       default 13
+       help
+       Select kernel stack size.  4KB stacks are best as they let
+       the system scale further.  Use 8KB stacks if you have an 
+       experimental kernel where a stack overlow with a 4KB stack
+       might occur.  Use 16KB stacks if you want to safely support
+       Windows device drivers using either Linuxant or ndiswrapper.
+
+config STACK_WARN
+       int "Print stack trace when stack grows beyond specified bytes"
+       default 4096 if IRQSTACKS
+       default 4096
+       help
+       The kernel will print a stack trace when the current stack exceeds
+       the specified size.
+
+config X86_STACK_CHECK
+       bool "Check for stack overflows"
+       default n
+       help
+       Say Y here to have the kernel attempt to detect when the per-task
+       kernel stack overflows.
+
+       Some older versions of gcc don't handle the -p option correctly.
+       Kernprof is affected by the same problem, which is described here:
+       http://oss.sgi.com/projects/kernprof/faq.html#Q9
+
+       Basically, if you get oopses in __free_pages_ok during boot when
+       you have this turned on, you need to fix gcc. The Redhat 2.96
+       version and gcc-3.x seem to work.
+
+       If not debugging a stack overflow problem, say N
+
+config STACK_PANIC
+       int "Panic when stack approaches with specified bytes of the stack limit"
+       depends on X86_STACK_CHECK
+       default 512 if IRQSTACKS
+       default 512
+       help
+       Panic if the stack grows to within specified byte range.
+
+config KEXEC
+       bool "kexec system call (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
+       help
+         kexec is a system call that implements the ability to shutdown your
+         current kernel, and to start another kernel.  It is like a reboot
+         but it is indepedent of the system firmware.   And like a reboot
+         you can start any kernel with it, not just Linux.
+
+         The name comes from the similiarity to the exec system call.
+
+         It is an ongoing process to be certain the hardware in a machine
+         is properly shutdown, so do not be surprised if this code does not
+         initially work for you.  It may help to enable device hotplugging
+         support.  As of this writing the exact hardware interface is
+         strongly in flux, so no good recommendation can be made.
+
 endmenu