1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 57864422a2c8..25c08c6c7f99 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -83,10 +83,10 @@ struct partition {
 } __attribute__((packed));
 
 struct disk_stats {
+        u64 nsecs[NR_STAT_GROUPS];
         unsigned long sectors[NR_STAT_GROUPS];
         unsigned long ios[NR_STAT_GROUPS];
         unsigned long merges[NR_STAT_GROUPS];
-        unsigned long ticks[NR_STAT_GROUPS];
         unsigned long io_ticks;
         unsigned long time_in_queue;
 };
@@ -354,6 +354,9 @@ static inline void free_part_stats(struct hd_struct *part)
 
 #endif /* CONFIG_SMP */
 
+#define part_stat_read_msecs(part, which)                               \
+        div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
+
 #define part_stat_read_accum(part, field)                               \
         (part_stat_read(part, field[STAT_READ]) +                       \
          part_stat_read(part, field[STAT_WRITE]) +                      \