linux-kernel - linux-next: manual merge of the akpm tree with the workqueues tree

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Date:	Wed, 13 Mar 2013 15:49:05 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: linux-next: manual merge of the akpm tree with the workqueues tree

Hi Andrew,

Today's linux-next merge of the akpm tree got a conflict in
kernel/workqueue.c between commit fa1b54e69bc6 ("workqueue: update
synchronization rules on worker_pool_idr") from the workqueues tree and
commit "workqueue: convert to idr_alloc()" from the akpm tree.

I fixed it up (I think - see below) and can carry the fix as necessary
(no action is required).

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --cc kernel/workqueue.c
index 2f43753,09bee1d..0000000
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@@ -456,31 -456,40 +456,31 @@@ static int worker_pool_assign_id(struc
  {
  	int ret;
  
 -	mutex_lock(&worker_pool_idr_mutex);
 -	ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_KERNEL);
 -	if (ret >= 0)
 -		pool->id = ret;
 -	mutex_unlock(&worker_pool_idr_mutex);
 +	do {
- 		if (!idr_pre_get(&worker_pool_idr, GFP_KERNEL))
- 			return -ENOMEM;
- 
++		idr_preload(GFP_KERNEL);
 +		spin_lock_irq(&workqueue_lock);
- 		ret = idr_get_new(&worker_pool_idr, pool, &pool->id);
++		ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_NOWAIT);
++		if (ret >= 0)
++			pool->id = ret;
 +		spin_unlock_irq(&workqueue_lock);
 +	} while (ret == -EAGAIN);
  
- 	return ret;
+ 	return ret < 0 ? ret : 0;
  }
  
 -/*
 - * Lookup worker_pool by id.  The idr currently is built during boot and
 - * never modified.  Don't worry about locking for now.
 +/**
 + * first_pwq - return the first pool_workqueue of the specified workqueue
 + * @wq: the target workqueue
 + *
 + * This must be called either with workqueue_lock held or sched RCU read
 + * locked.  If the pwq needs to be used beyond the locking in effect, the
 + * caller is responsible for guaranteeing that the pwq stays online.
   */
 -static struct worker_pool *worker_pool_by_id(int pool_id)
 -{
 -	return idr_find(&worker_pool_idr, pool_id);
 -}
 -
 -static struct worker_pool *get_std_worker_pool(int cpu, bool highpri)
 -{
 -	struct worker_pool *pools = std_worker_pools(cpu);
 -
 -	return &pools[highpri];
 -}
 -
 -static struct pool_workqueue *get_pwq(unsigned int cpu,
 -				      struct workqueue_struct *wq)
 +static struct pool_workqueue *first_pwq(struct workqueue_struct *wq)
  {
 -	if (!(wq->flags & WQ_UNBOUND)) {
 -		if (likely(cpu < nr_cpu_ids))
 -			return per_cpu_ptr(wq->pool_wq.pcpu, cpu);
 -	} else if (likely(cpu == WORK_CPU_UNBOUND))
 -		return wq->pool_wq.single;
 -	return NULL;
 +	assert_rcu_or_wq_lock();
 +	return list_first_or_null_rcu(&wq->pwqs, struct pool_workqueue,
 +				      pwqs_node);
  }
  
  static unsigned int work_color_to_flags(int color)

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