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authorWang Long <wanglong19@meituan.com>2017-11-19 16:08:37 -0500
committerTejun Heo <tj@kernel.org>2017-11-27 11:37:33 -0800
commitddf7005f32212f28669032651e09bd8d2245c35d (patch)
tree5fb56a56fcdfed62892a8e662d53f893a18c11ca /kernel
parent1599a185f0e6113be185b9fb809c621c73865829 (diff)
downloadlinux-ddf7005f32212f28669032651e09bd8d2245c35d.tar.bz2
debug cgroup: use task_css_set instead of rcu_dereference
This macro `task_css_set` verifies that the caller is inside proper critical section if the kernel set CONFIG_PROVE_RCU=y. Signed-off-by: Wang Long <wanglong19@meituan.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup/debug.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c
index 5f780d8f6a9d..9caeda610249 100644
--- a/kernel/cgroup/debug.c
+++ b/kernel/cgroup/debug.c
@@ -50,7 +50,7 @@ static int current_css_set_read(struct seq_file *seq, void *v)
spin_lock_irq(&css_set_lock);
rcu_read_lock();
- cset = rcu_dereference(current->cgroups);
+ cset = task_css_set(current);
refcnt = refcount_read(&cset->refcount);
seq_printf(seq, "css_set %pK %d", cset, refcnt);
if (refcnt > cset->nr_tasks)
@@ -96,7 +96,7 @@ static int current_css_set_cg_links_read(struct seq_file *seq, void *v)
spin_lock_irq(&css_set_lock);
rcu_read_lock();
- cset = rcu_dereference(current->cgroups);
+ cset = task_css_set(current);
list_for_each_entry(link, &cset->cgrp_links, cgrp_link) {
struct cgroup *c = link->cgrp;