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| author | Christoph Hellwig <hch@lst.de> | 2019-06-06 12:26:19 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-20 10:32:34 -0600 |
| commit | 239eeb085753d4356f731a773f363eb5bed4fe81 (patch) | |
| tree | bba7ae13bbc54a1ac631d2d7eb9c3fb67dd6ca3c /block | |
| parent | 1aa0a133fbabeca9e8785fb11de471841009d6d9 (diff) | |
| download | linux-239eeb085753d4356f731a773f363eb5bed4fe81.tar.gz linux-239eeb085753d4356f731a773f363eb5bed4fe81.tar.bz2 linux-239eeb085753d4356f731a773f363eb5bed4fe81.zip | |
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.c | 5 |
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(); |