ia64: Based on patch by Rohit Seth: Use "hint @pause" in more places.

include/asm-ia64/processor.h

@@ -624,8 +624,13 @@ ia64_set_lrr0 (unsigned long val)
 	asm volatile ("mov cr.lrr0=%0;; srlz.d" :: "r"(val) : "memory");
 }
 
-#define cpu_relax()	barrier()
+static inline void
+ia64_hint_pause (void)
+{
+	asm volatile ("hint @pause" ::: "memory");
+}
 
+#define cpu_relax()	ia64_hint_pause()
 
 static inline void
 ia64_set_lrr1 (unsigned long val)

include/asm-ia64/spinlock.h

@@ -133,8 +133,7 @@ do {											\
 	while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, "acq") < 0)) {	\
 		ia64_fetchadd(-1, (int *) __read_lock_ptr, "rel");			\
 		while (*(volatile int *)__read_lock_ptr < 0)				\
-			barrier();							\
-											\
+			cpu_relax();							\
 	}										\
 } while (0)