workqueue: use rcu_dereference_sched() in workqueue_congested()

workqueue_congested() fetches the pwq out of wq->cpu_pwq with a plain
load, so sparse complains about the dropped __rcu:

  kernel/workqueue.c:6304:13: sparse: incorrect type in assignment (different address spaces) @@     expected struct pool_workqueue *pwq @@     got struct pool_workqueue [noderef] __rcu * @@

A pwq is released with kfree_rcu() and the read is protected by the
surrounding preempt_disable(), which is what
commit fd5081f4ef33 ("workqueue: Remove redundant rcu_read_lock/unlock() in
workqueue_congested()") relied on when it dropped the rcu_read_lock()
here.

Use the rcu_dereference_sched() helper to make that explicit.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202608120931.tvTzq1gD-lkp@intel.com/
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

0 files changed, 0 insertions, 0 deletions