linux-2.6.11-exec-shield.patch has

--- linux/include/asm-x86_64/processor.h.orig
+++ linux/include/asm-x86_64/processor.h
@@ -164,6 +164,15 @@ static inline void clear_in_cr4 (unsigne
  */
 #define TASK_SIZE      (0x800000000000UL)

+#define TASK_SIZE_64   (0x800000000000)
+
+#define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE_64)
+
+#define __HAVE_ARCH_ALIGN_STACK
+extern unsigned long arch_align_stack(unsigned long sp);
+
+#define HAVE_ARCH_PICK_MMAP_LAYOUT
+
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */

It leads to

In file included from include/linux/spinlock.h:16,
                 from include/linux/capability.h:45,
                 from include/linux/sched.h:7,
                 from init/calibrate.c:7:
include/asm/processor.h:169:1: warning: "TASK_SIZE" redefined
include/asm/processor.h:165:1: warning: this is the location of the previous
definition

What is wrong with `UL'? Shouldn't the first "TASK_SIZE" be deleted?