Commit ddf7005f authored by Wang Long's avatar Wang Long Committed by Tejun Heo
Browse files

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: default avatarWang Long <wanglong19@meituan.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 1599a185

kernel/cgroup/debug.c

+2 −2
Original line number Diff line number Diff line
@@ -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;