On 2016/6/23 4:28, Daniel Bristot de Oliveira wrote:

While testing the deadline scheduler + cgroup setup I hit this
warning.

...

The warn is the spin_(lock|unlock)_bh(&css_set_lock) in the interrupt
context. Converting the spin_lock_bh to spin_lock_irq(save) to avoid
this problem - and other problems of sharing a spinlock with an
interrupt.

Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <redacted>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Juri Lelli <redacted>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: cgroups@vger.kernel.org
Cc: stable@vger.kernel.org # 4.5+
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Rik van Riel <redacted>
Reviewed-by: "Luis Claudio R. Goncalves" <redacted>
Signed-off-by: Daniel Bristot de Oliveira <redacted>

Acked-by: Zefan Li <redacted>