Hi Tejun, After merging the workqueues tree, today's linux-next build (arm multi_v7_defconfig) failed like this: kernel/workqueue.c: In function 'unbound_pwq_by_node': kernel/workqueue.c:570:2: error: implicit declaration of function 'rcu_lockdep_assert' [-Werror=implicit-function-declaration] assert_rcu_or_wq_mutex_or_pool_mutex(wq); ^ kernel/workqueue.c:570:2: error: implicit declaration of function 'lockdep_is_held' [-Werror=implicit-function-declaration] Caused by commit: 5b95e1af8d17 ("workqueue: wq_pool_mutex protects the attrs-installation") from the workqueues tree interacting with commit: eeacf8982637 ("rcu: Rename rcu_lockdep_assert() to RCU_LOCKDEP_WARN()") from the rcu tree. I applied the followinf merge fix patch: From: Stephen Rothwell Date: Sat, 20 Jun 2015 19:39:43 +1000 Subject: [PATCH] workqueue: fix up for rcu_lockdep_assert() rename Signed-off-by: Stephen Rothwell --- kernel/workqueue.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 837427cc5bdf..44cd4144ebcb 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -348,10 +348,10 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq); "sched RCU or wq->mutex should be held") #define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \ - rcu_lockdep_assert(rcu_read_lock_sched_held() || \ - lockdep_is_held(&wq->mutex) || \ - lockdep_is_held(&wq_pool_mutex), \ - "sched RCU, wq->mutex or wq_pool_mutex should be held") + RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \ + !lockdep_is_held(&wq->mutex) && \ + !lockdep_is_held(&wq_pool_mutex), \ + "sched RCU, wq->mutex or wq_pool_mutex should be held") #define for_each_cpu_worker_pool(pool, cpu) \ for ((pool) = &per_cpu(cpu_worker_pools, cpu)[0]; \ -- 2.1.4 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au