From: Michal Koutný <mkoutny@suse.com>
Date: Tue, 11 Mar 2025 12:36:20 +0000 (+0100)
Subject: cgroup/blkio: Add deprecation messages to reset_stats
X-Git-Tag: v6.15-rc1~228^2~11
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=77bbb259db53ab5f0c971cf0180c28c897a06b9f;p=thirdparty%2Flinux.git

cgroup/blkio: Add deprecation messages to reset_stats

It is difficult to sync with stat updaters, stats are (should be)
monotonic so users can calculate differences from a reference.

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 45a395862fbc8..b3e5184b10d5f 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -659,6 +659,7 @@ static int blkcg_reset_stats(struct cgroup_subsys_state *css,
 	struct blkcg_gq *blkg;
 	int i;
 
+	pr_info_once("blkio.%s is deprecated\n", cftype->name);
 	mutex_lock(&blkcg_pol_mutex);
 	spin_lock_irq(&blkcg->lock);