1 files changed, 4 insertions, 1 deletions

diff --git a/include/asm-i386/mc146818rtc.h b/include/asm-i386/mc146818rtc.h
index 99a890047023..1613b42eaf58 100644
--- a/include/asm-i386/mc146818rtc.h
+++ b/include/asm-i386/mc146818rtc.h
@@ -6,6 +6,7 @@
 
 #include <asm/io.h>
 #include <asm/system.h>
+#include <asm/processor.h>
 #include <linux/mc146818rtc.h>
 
 #ifndef RTC_PORT
@@ -43,8 +44,10 @@ static inline void lock_cmos(unsigned char reg)
         unsigned long new;
         new = ((smp_processor_id()+1) << 8) | reg;
         for (;;) {
-                if (cmos_lock)
+                if (cmos_lock) {
+                        cpu_relax();
                         continue;
+                }
                 if (__cmpxchg(&cmos_lock, 0, new, sizeof(cmos_lock)) == 0)
                         return;
         }