sunrpc: change sp_nrthreads from atomic_t to unsigned int.

sp_nrthreads is only ever accessed under the service mutex
  nlmsvc_mutex nfs_callback_mutex nfsd_mutex
so these is no need for it to be an atomic_t.

The fact that all code using it is single-threaded means that we can
simplify svc_pool_victim and remove the temporary elevation of
sp_nrthreads.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 11 insertions, 20 deletions

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 2e148137376d..9442ebf38bbd 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -725,7 +725,7 @@ svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
 	serv->sv_nrthreads += 1;
 	spin_unlock_bh(&serv->sv_lock);
 
-	atomic_inc(&pool->sp_nrthreads);
+	pool->sp_nrthreads += 1;
 
 	/* Protected by whatever lock the service uses when calling
 	 * svc_set_num_threads()
@@ -780,31 +780,22 @@ svc_pool_victim(struct svc_serv *serv, struct svc_pool *target_pool,
 	struct svc_pool *pool;
 	unsigned int i;
 
-retry:
 	pool = target_pool;
 
-	if (pool != NULL) {
-		if (atomic_inc_not_zero(&pool->sp_nrthreads))
-			goto found_pool;
-		return NULL;
-	} else {
+	if (!pool) {
 		for (i = 0; i < serv->sv_nrpools; i++) {
 			pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
-			if (atomic_inc_not_zero(&pool->sp_nrthreads))
-				goto found_pool;
+			if (pool->sp_nrthreads)
+				break;
 		}
-		return NULL;
 	}
 
-found_pool:
-	set_bit(SP_VICTIM_REMAINS, &pool->sp_flags);
-	set_bit(SP_NEED_VICTIM, &pool->sp_flags);
-	if (!atomic_dec_and_test(&pool->sp_nrthreads))
+	if (pool && pool->sp_nrthreads) {
+		set_bit(SP_VICTIM_REMAINS, &pool->sp_flags);
+		set_bit(SP_NEED_VICTIM, &pool->sp_flags);
 		return pool;
-	/* Nothing left in this pool any more */
-	clear_bit(SP_NEED_VICTIM, &pool->sp_flags);
-	clear_bit(SP_VICTIM_REMAINS, &pool->sp_flags);
-	goto retry;
+	}
+	return NULL;
 }
 
 static int
@@ -883,7 +874,7 @@ svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
 	if (!pool)
 		nrservs -= serv->sv_nrthreads;
 	else
-		nrservs -= atomic_read(&pool->sp_nrthreads);
+		nrservs -= pool->sp_nrthreads;
 
 	if (nrservs > 0)
 		return svc_start_kthreads(serv, pool, nrservs);
@@ -967,7 +958,7 @@ svc_exit_thread(struct svc_rqst *rqstp)
 
 	list_del_rcu(&rqstp->rq_all);
 
-	atomic_dec(&pool->sp_nrthreads);
+	pool->sp_nrthreads -= 1;
 
 	spin_lock_bh(&serv->sv_lock);
 	serv->sv_nrthreads -= 1;