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-rw-r--r--include/linux/blkdev.h9
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)