[PARISC] Add PREEMPT support

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/include/asm-parisc/thread_info.h b/include/asm-parisc/thread_info.h
index ac32f14..f2f83b0 100644
--- a/include/asm-parisc/thread_info.h
+++ b/include/asm-parisc/thread_info.h
@@ -49,7 +49,8 @@
 
 #endif /* !__ASSEMBLY */
 
-#define PREEMPT_ACTIVE          0x10000000
+#define PREEMPT_ACTIVE_BIT	28
+#define PREEMPT_ACTIVE		(1 << PREEMPT_ACTIVE_BIT)
 
 /*
  * thread information flags