drm/amdkfd: use time_is_before_jiffies(a + b) to replace "jiffies - a > b"

time_is_before_jiffies deals with timer wrapping correctly.

Signed-off-by: Yu Zhe <yuzhe@nfschina.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c

@@ -146,7 +146,7 @@ static void interrupt_wq(struct work_struct *work)
 	struct kfd_dev *dev = container_of(work, struct kfd_dev,
 						interrupt_work);
 	uint32_t ih_ring_entry[KFD_MAX_RING_ENTRY_SIZE];
-	long start_jiffies = jiffies;
+	unsigned long start_jiffies = jiffies;
 
 	if (dev->device_info.ih_ring_entry_size > sizeof(ih_ring_entry)) {
 		dev_err_once(dev->adev->dev, "Ring entry too small\n");
@@ -156,7 +156,7 @@ static void interrupt_wq(struct work_struct *work)
 	while (dequeue_ih_ring_entry(dev, ih_ring_entry)) {
 		dev->device_info.event_interrupt_class->interrupt_wq(dev,
 								ih_ring_entry);
-		if (jiffies - start_jiffies > HZ) {
+		if (time_is_before_jiffies(start_jiffies + HZ)) {
 			/* If we spent more than a second processing signals,
 			 * reschedule the worker to avoid soft-lockup warnings
 			 */