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authorChristoph Hellwig <hch@lst.de>2019-06-06 13:26:19 +0300
committerJens Axboe <axboe@kernel.dk>2019-06-20 19:32:34 +0300
commit239eeb085753d4356f731a773f363eb5bed4fe81 (patch)
treebba7ae13bbc54a1ac631d2d7eb9c3fb67dd6ca3c /block
parent1aa0a133fbabeca9e8785fb11de471841009d6d9 (diff)
downloadlinux-239eeb085753d4356f731a773f363eb5bed4fe81.tar.xz
blk-cgroup: factor out a helper to read rwstat counter
Trying to break up the crazy statements to something readable. Also switch to an unsigned counter as it can't ever turn negative. Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 440797293235..0778e52b1db2 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -745,7 +745,7 @@ struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkcg_gq *blkg,
struct blkcg_gq *pos_blkg;
struct cgroup_subsys_state *pos_css;
struct blkg_rwstat sum = { };
- int i;
+ unsigned int i;
lockdep_assert_held(&blkg->q->queue_lock);
@@ -762,8 +762,7 @@ struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkcg_gq *blkg,
rwstat = (void *)pos_blkg + off;
for (i = 0; i < BLKG_RWSTAT_NR; i++)
- atomic64_add(atomic64_read(&rwstat->aux_cnt[i]) +
- percpu_counter_sum_positive(&rwstat->cpu_cnt[i]),
+ atomic64_add(blkg_rwstat_read_counter(rwstat, i),
&sum.aux_cnt[i]);
}
rcu_read_unlock();