Merge branch 'x86/urgent' into x86/asm

Get the cr4 fixes so we can apply the final cleanup

2 files changed, 18 insertions, 4 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 13f5a6c1de76..c207fa9870eb 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -296,17 +296,29 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
 	if (ret)
 		return ERR_PTR(ret);
 
+	/*
+	 * Check if the hardware context is actually mapped to anything.
+	 * If not tell the caller that it should skip this queue.
+	 */
 	hctx = q->queue_hw_ctx[hctx_idx];
+	if (!blk_mq_hw_queue_mapped(hctx)) {
+		ret = -EXDEV;
+		goto out_queue_exit;
+	}
 	ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask));
 
 	blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
 	rq = __blk_mq_alloc_request(&alloc_data, rw, 0);
 	if (!rq) {
-		blk_queue_exit(q);
-		return ERR_PTR(-EWOULDBLOCK);
+		ret = -EWOULDBLOCK;
+		goto out_queue_exit;
 	}
 
 	return rq;
+
+out_queue_exit:
+	blk_queue_exit(q);
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);
 
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index f1aba26f4719..a3ea8260c94c 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -780,9 +780,11 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio,
 	/*
 	 * If previous slice expired, start a new one otherwise renew/extend
 	 * existing slice to make sure it is at least throtl_slice interval
-	 * long since now.
+	 * long since now. New slice is started only for empty throttle group.
+	 * If there is queued bio, that means there should be an active
+	 * slice and it should be extended instead.
 	 */
-	if (throtl_slice_used(tg, rw))
+	if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))
 		throtl_start_new_slice(tg, rw);
 	else {
 		if (time_before(tg->slice_end[rw], jiffies + throtl_slice))