Patch "blk-rq-qos: constify rq_qos_ops" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    blk-rq-qos: constify rq_qos_ops

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     blk-rq-qos-constify-rq_qos_ops.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit aa235b97093a21478dc99fd9638fc62d88af5f17
Author: Christoph Hellwig <hch@xxxxxx>
Date:   Fri Feb 3 16:03:55 2023 +0100

    blk-rq-qos: constify rq_qos_ops
    
    [ Upstream commit 3963d84df7974b6687cb34bce3b9e0b2686f839c ]
    
    These op vectors are constant, so mark them const.
    
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Reviewed-by: Andreas Herrmann <aherrmann@xxxxxxx>
    Acked-by: Tejun Heo <tj@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230203150400.3199230-15-hch@xxxxxx
    Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
    Stable-dep-of: f814bdda774c ("blk-wbt: Fix detection of dirty-throttled tasks")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index a8a7d2ce927b9..78958c5bece08 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2836,7 +2836,7 @@ static void ioc_rqos_exit(struct rq_qos *rqos)
 	kfree(ioc);
 }
 
-static struct rq_qos_ops ioc_rqos_ops = {
+static const struct rq_qos_ops ioc_rqos_ops = {
 	.throttle = ioc_rqos_throttle,
 	.merge = ioc_rqos_merge,
 	.done_bio = ioc_rqos_done_bio,
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index c64cfec34ac37..b0f8550f87cd2 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -651,7 +651,7 @@ static void blkcg_iolatency_exit(struct rq_qos *rqos)
 	kfree(blkiolat);
 }
 
-static struct rq_qos_ops blkcg_iolatency_ops = {
+static const struct rq_qos_ops blkcg_iolatency_ops = {
 	.throttle = blkcg_iolatency_throttle,
 	.done_bio = blkcg_iolatency_done_bio,
 	.exit = blkcg_iolatency_exit,
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index 14bee1bd76136..8e83734cfe8db 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -296,7 +296,7 @@ void rq_qos_exit(struct request_queue *q)
 }
 
 int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
-		struct rq_qos_ops *ops)
+		const struct rq_qos_ops *ops)
 {
 	struct request_queue *q = disk->queue;
 
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 22552785aa31e..2b7b668479f71 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -25,7 +25,7 @@ struct rq_wait {
 };
 
 struct rq_qos {
-	struct rq_qos_ops *ops;
+	const struct rq_qos_ops *ops;
 	struct request_queue *q;
 	enum rq_qos_id id;
 	struct rq_qos *next;
@@ -86,7 +86,7 @@ static inline void rq_wait_init(struct rq_wait *rq_wait)
 }
 
 int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
-		struct rq_qos_ops *ops);
+		const struct rq_qos_ops *ops);
 void rq_qos_del(struct rq_qos *rqos);
 
 typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data);
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index aec4e37c89c4a..d9398347b08d8 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -808,7 +808,7 @@ static const struct blk_mq_debugfs_attr wbt_debugfs_attrs[] = {
 };
 #endif
 
-static struct rq_qos_ops wbt_rqos_ops = {
+static const struct rq_qos_ops wbt_rqos_ops = {
 	.throttle = wbt_wait,
 	.issue = wbt_issue,
 	.track = wbt_track,