diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8b7f5e0914a..09a840264d6 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1211,14 +1211,23 @@ struct work_struct; int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); #ifdef CONFIG_BLK_CGROUP +/* + * This should not be using sched_clock(). A real patch is in progress + * to fix this up, until that is in place we need to disable preemption + * around sched_clock() in this function and set_io_start_time_ns(). + */ static inline void set_start_time_ns(struct request *req) { + preempt_disable(); req->start_time_ns = sched_clock(); + preempt_enable(); } static inline void set_io_start_time_ns(struct request *req) { + preempt_disable(); req->io_start_time_ns = sched_clock(); + preempt_enable(); } static inline uint64_t rq_start_time_ns(struct request *req) |