1 files changed, 4 insertions, 2 deletions

diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index e7e9682a33e9..f556c4843aa1 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -80,9 +80,11 @@ static inline unsigned int __getcpu(void)
 
         /*
          * Load per CPU data from GDT.  LSL is faster than RDTSCP and
-         * works on all CPUs.
+         * works on all CPUs.  This is volatile so that it orders
+         * correctly wrt barrier() and to keep gcc from cleverly
+         * hoisting it out of the calling function.
          */
-        asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
+        asm volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
 
         return p;
 }