cris: Use common threadinfo allocator

There is no functional difference. __get_free_pages() ends up calling
alloc_pages_node().

This also allocates only one page which matches THREAD_SIZE instead of
an extra page for nothing.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Link: http://lkml.kernel.org/r/20120505150141.681236240@linutronix.de

arch/cris/include/asm/processor.h

@@ -25,13 +25,12 @@ struct task_struct;
  */
 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
 
-/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
+/* THREAD_SIZE is the size of the thread_info/kernel_stack combo.
  * normally, the stack is found by doing something like p + THREAD_SIZE
  * in CRIS, a page is 8192 bytes, which seems like a sane size
  */
-
 #define THREAD_SIZE       PAGE_SIZE
-#define KERNEL_STACK_SIZE PAGE_SIZE
+#define THREAD_SIZE_ORDER (0)
 
 /*
  * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.

arch/cris/include/asm/thread_info.h

@@ -65,12 +65,6 @@ struct thread_info {
 
 #define init_thread_info	(init_thread_union.thread_info)
 
-#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
-/* thread information allocation */
-#define alloc_thread_info_node(tsk, node)	\
-	((struct thread_info *) __get_free_pages(GFP_KERNEL, 1))
-#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
-
 #endif /* !__ASSEMBLY__ */
 
 /*