Instruction pointer comparisons for the NMI on debug stack check/fixup
were incorrect.

From: Jan Beulich <jbeulich@novell.com>

--- /home/jbeulich/tmp/linux-2.6.14/arch/i386/kernel/entry.S	2005-10-28 02:02:08.000000000 +0200
+++ 2.6.14/arch/i386/kernel/entry.S	2005-11-04 12:18:57.000000000 +0100
@@ -560,11 +560,10 @@ nmi_stack_fixup:
 nmi_debug_stack_check:
 	cmpw $__KERNEL_CS,16(%esp)
 	jne nmi_stack_correct
-	cmpl $debug - 1,(%esp)
-	jle nmi_stack_correct
+	cmpl $debug,(%esp)
+	jb nmi_stack_correct
 	cmpl $debug_esp_fix_insn,(%esp)
-	jle nmi_debug_stack_fixup
-nmi_debug_stack_fixup:
+	ja nmi_stack_correct
 	FIX_STACK(24,nmi_stack_correct, 1)
 	jmp nmi_stack_correct