2020-01-18 03:12:18

by Madhuparna Bhowmik

Subject: [PATCH] cgroup.c: Use built-in RCU list checking

From: Madhuparna Bhowmik <[email protected]>

list_for_each_entry_rcu has built-in RCU and lock checking.
Pass cond argument to list_for_each_entry_rcu() to silence
false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
by default.

Even though the function css_next_child() already checks if
cgroup_mutex or rcu_read_lock() is held using
cgroup_assert_mutex_or_rcu_locked(), there is a need to pass
cond to list_for_each_entry_rcu() to avoid false positive
lockdep warning.

Signed-off-by: Madhuparna Bhowmik <[email protected]>
---
kernel/cgroup/cgroup.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 735af8f15f95..c2959764ad95 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4152,7 +4152,8 @@ struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
} else if (likely(!(pos->flags & CSS_RELEASED))) {
next = list_entry_rcu(pos->sibling.next, struct cgroup_subsys_state, sibling);
} else {
- list_for_each_entry_rcu(next, &parent->children, sibling)
+ list_for_each_entry_rcu(next, &parent->children, sibling,
+ lockdep_is_held(&cgroup_mutex))
if (next->serial_nr > pos->serial_nr)
break;
}
--
2.17.1

2020-01-29 14:24:07

by Michal Koutný

Subject: Re: [PATCH] cgroup.c: Use built-in RCU list checking

Hello.

On Sat, Jan 18, 2020 at 08:40:51AM +0530, [email protected] wrote:
> From: Madhuparna Bhowmik <[email protected]>
>
> list_for_each_entry_rcu has built-in RCU and lock checking.
> Pass cond argument to list_for_each_entry_rcu() to silence
> false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
> by default.
I assume if you've seen the RCU warning, you haven't seen the warning
from cgroup_assert_mutex_or_rcu_locked() above.

The patch makes sense to me from the consistency POV.

Acked-by: Michal Koutn? <[email protected]>

Michal

2020-01-29 16:10:57

by Madhuparna Bhowmik

Subject: Re: [PATCH] cgroup.c: Use built-in RCU list checking

On Wed, Jan 29, 2020 at 03:22:55PM +0100, Michal Koutn? wrote:
> Hello.
>
> On Sat, Jan 18, 2020 at 08:40:51AM +0530, [email protected] wrote:
> > From: Madhuparna Bhowmik <[email protected]>
> >
> > list_for_each_entry_rcu has built-in RCU and lock checking.
> > Pass cond argument to list_for_each_entry_rcu() to silence
> > false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
> > by default.
> I assume if you've seen the RCU warning, you haven't seen the warning
> from cgroup_assert_mutex_or_rcu_locked() above.
>
No, I haven't seen any warning from cgroup_assert_mutex_or_rcu_locked(),
I am just doing the conversions to prevent any false lockdep warnings
because of CONFIG_PROVE_RCU_LIST in the future.

> The patch makes sense to me from the consistency POV.
>
Thank you,
Madhuparna

> Acked-by: Michal Koutn? <[email protected]>
>
> Michal

2020-02-12 22:14:37

by Tejun Heo

Subject: Re: [PATCH] cgroup.c: Use built-in RCU list checking

On Sat, Jan 18, 2020 at 08:40:51AM +0530, [email protected] wrote:
> From: Madhuparna Bhowmik <[email protected]>
>
> list_for_each_entry_rcu has built-in RCU and lock checking.
> Pass cond argument to list_for_each_entry_rcu() to silence
> false lockdep warning when CONFIG_PROVE_RCU_LIST is enabled
> by default.
>
> Even though the function css_next_child() already checks if
> cgroup_mutex or rcu_read_lock() is held using
> cgroup_assert_mutex_or_rcu_locked(), there is a need to pass
> cond to list_for_each_entry_rcu() to avoid false positive
> lockdep warning.
>
> Signed-off-by: Madhuparna Bhowmik <[email protected]>

Applied to cgroup/for-5.7.

Thanks.

--
tejun