--- zzzz-none-000/linux-2.6.19.2/arch/x86_64/kernel/traps.c	2007-01-10 19:10:37.000000000 +0000
+++ davinci-8020-5504/linux-2.6.19.2/arch/x86_64/kernel/traps.c	2007-01-11 07:38:19.000000000 +0000
@@ -242,19 +242,12 @@
  * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
  */
 
-static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
-{
-	void *t = (void *)tinfo;
-        return p > t && p < t + THREAD_SIZE - 3;
-}
-
 void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack,
 		struct stacktrace_ops *ops, void *data)
 {
 	const unsigned cpu = smp_processor_id();
 	unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
 	unsigned used = 0;
-	struct thread_info *tinfo;
 
 	if (!tsk)
 		tsk = current;
@@ -297,12 +290,6 @@
 		if (tsk && tsk != current)
 			stack = (unsigned long *)tsk->thread.rsp;
 	}
-	/*
-	 * Align the stack pointer on word boundary, later loops
-	 * rely on that (and corruption / debug info bugs can cause
-	 * unaligned values here):
-	 */
-	stack = (unsigned long *)((unsigned long)stack & ~(sizeof(long)-1));
 
 	/*
 	 * Print function call entries within a stack. 'cond' is the
@@ -377,8 +364,7 @@
 	/*
 	 * This handles the process stack:
 	 */
-	tinfo = current_thread_info();
-	HANDLE_STACK (valid_stack_ptr(tinfo, stack));
+	HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
 #undef HANDLE_STACK
 }
 EXPORT_SYMBOL(dump_trace);