[PATCH] ppc32 stack bounds checking

From: William Lee Irwin III <wli@holomorphy.com>

The stack is now shared with struct thread_info on most arches, not task_t.
This mostly affects get_wchan() and stack usage debug.

arch/ppc/kernel/process.c

@@ -83,7 +83,7 @@ kernel_stack_top(struct task_struct *tsk)
 unsigned long
 task_top(struct task_struct *tsk)
 {
-	return ((unsigned long)tsk) + sizeof(struct task_struct);
+	return ((unsigned long)tsk) + sizeof(struct thread_info);
 }
 
 /* check to make sure the kernel stack is healthy */