1 files changed, 5 insertions, 4 deletions

diff --git a/kernel/time/timecompare.c b/kernel/time/timecompare.c
index 71e7f1a19156..ac38fbb176cc 100644
--- a/kernel/time/timecompare.c
+++ b/kernel/time/timecompare.c
@@ -19,6 +19,7 @@
 
 #include <linux/timecompare.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/math64.h>
 
 /*
@@ -40,7 +41,7 @@ ktime_t timecompare_transform(struct timecompare *sync,
 
         return ns_to_ktime(nsec);
 }
-EXPORT_SYMBOL(timecompare_transform);
+EXPORT_SYMBOL_GPL(timecompare_transform);
 
 int timecompare_offset(struct timecompare *sync,
                        s64 *offset,
@@ -89,7 +90,7 @@ int timecompare_offset(struct timecompare *sync,
                          * source time
                          */
                         sample.offset =
-                                ktime_to_ns(ktime_add(end, start)) / 2 -
+                                (ktime_to_ns(end) + ktime_to_ns(start)) / 2 -
                                 ts;
 
                         /* simple insertion sort based on duration */
@@ -131,7 +132,7 @@ int timecompare_offset(struct timecompare *sync,
 
         return used;
 }
-EXPORT_SYMBOL(timecompare_offset);
+EXPORT_SYMBOL_GPL(timecompare_offset);
 
 void __timecompare_update(struct timecompare *sync,
                           u64 source_tstamp)
@@ -188,4 +189,4 @@ void __timecompare_update(struct timecompare *sync,
                 }
         }
 }
-EXPORT_SYMBOL(__timecompare_update);
+EXPORT_SYMBOL_GPL(__timecompare_update);