Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...

[platform/adaptation/renesas_rcar/renesas_kernel.git] / block / blk-cgroup.c

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f46f3c6..e90c7c1 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -614,15 +614,13 @@ u64 blkg_stat_recursive_sum(struct blkg_policy_data *pd, int off)
 {
        struct blkcg_policy *pol = blkcg_policy[pd->plid];
        struct blkcg_gq *pos_blkg;
-       struct cgroup *pos_cgrp;
-       u64 sum;
+       struct cgroup_subsys_state *pos_css;
+       u64 sum = 0;
 
        lockdep_assert_held(pd->blkg->q->queue_lock);
 
-       sum = blkg_stat_read((void *)pd + off);
-
        rcu_read_lock();
-       blkg_for_each_descendant_pre(pos_blkg, pos_cgrp, pd_to_blkg(pd)) {
+       blkg_for_each_descendant_pre(pos_blkg, pos_css, pd_to_blkg(pd)) {
                struct blkg_policy_data *pos_pd = blkg_to_pd(pos_blkg, pol);
                struct blkg_stat *stat = (void *)pos_pd + off;
 
@@ -649,16 +647,14 @@ struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkg_policy_data *pd,
 {
        struct blkcg_policy *pol = blkcg_policy[pd->plid];
        struct blkcg_gq *pos_blkg;
-       struct cgroup *pos_cgrp;
-       struct blkg_rwstat sum;
+       struct cgroup_subsys_state *pos_css;
+       struct blkg_rwstat sum = { };
        int i;
 
        lockdep_assert_held(pd->blkg->q->queue_lock);
 
-       sum = blkg_rwstat_read((void *)pd + off);
-
        rcu_read_lock();
-       blkg_for_each_descendant_pre(pos_blkg, pos_cgrp, pd_to_blkg(pd)) {
+       blkg_for_each_descendant_pre(pos_blkg, pos_css, pd_to_blkg(pd)) {
                struct blkg_policy_data *pos_pd = blkg_to_pd(pos_blkg, pol);
                struct blkg_rwstat *rwstat = (void *)pos_pd + off;
                struct blkg_rwstat tmp;
@@ -891,7 +887,7 @@ static int blkcg_can_attach(struct cgroup_subsys_state *css,
        int ret = 0;
 
        /* task_lock() is needed to avoid races with exit_io_context() */
-       cgroup_taskset_for_each(task, css->cgroup, tset) {
+       cgroup_taskset_for_each(task, css, tset) {
                task_lock(task);
                ioc = task->io_context;
                if (ioc && atomic_read(&ioc->nr_tasks) > 1)