diff options
| author | Tejun Heo <tj@kernel.org> | 2019-11-15 01:31:28 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-18 18:40:41 +0300 |
| commit | 496074f94b19574c77240d3b3f84cfb1097de51d (patch) | |
| tree | 508ec8a8c34bec8cd9eadfcc2fc1fcb89bffd566 /include | |
| parent | de678bc63cc659d056a5ff3a3b11866d3eb4c1a9 (diff) | |
| download | linux-496074f94b19574c77240d3b3f84cfb1097de51d.tar.xz | |
blk-cgroup: cgroup_rstat_updated() shouldn't be called on cgroup1
Currently, cgroup rstat is supported only on cgroup2 hierarchy and
rstat functions shouldn't be called on cgroup1 cgroups. While
converting blk-cgroup core statistics to rstat, f73316482977
("blk-cgroup: reimplement basic IO stats using cgroup rstat")
accidentally ended up calling cgroup_rstat_updated() on cgroup1
cgroups causing crashes.
Longer term, we probably should add cgroup1 support to rstat but for
now let's mask the call directly.
Fixes: f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat")
Tested-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blk-cgroup.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index 48a66738143d..19394c77ed99 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -626,7 +626,8 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q, bis->cur.ios[rwd]++; u64_stats_update_end(&bis->sync); - cgroup_rstat_updated(blkg->blkcg->css.cgroup, cpu); + if (cgroup_subsys_on_dfl(io_cgrp_subsys)) + cgroup_rstat_updated(blkg->blkcg->css.cgroup, cpu); put_cpu(); } |