From 1beba52d46f039a24f31cf5717c239c89a9d4e6f Mon Sep 17 00:00:00 2001 From: Bhaktipriya Shridhar Date: Sat, 13 Aug 2016 22:16:24 +0530 Subject: [PATCH] android: binder: Remove deprecated create_singlethread_workqueue The workqueue is being used to run deferred work for the android binder. The "binder_deferred_workqueue" queues only a single work item and hence does not require ordering. Also, this workqueue is not being used on a memory recliam path. Hence, the singlethreaded workqueue has been replaced with the use of system_wq. System workqueues have been able to handle high level of concurrency for a long time now and hence it's not required to have a singlethreaded workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue created with create_singlethread_workqueue(), system_wq allows multiple work items to overlap executions even on the same CPU; however, a per-cpu workqueue doesn't have any CPU locality or global ordering guarantee unless the target CPU is explicitly specified and thus the increase of local concurrency shouldn't make any difference. Signed-off-by: Bhaktipriya Shridhar Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 16288e777ec3..562af94bec35 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -59,7 +59,6 @@ static struct dentry *binder_debugfs_dir_entry_proc; static struct binder_node *binder_context_mgr_node; static kuid_t binder_context_mgr_uid = INVALID_UID; static int binder_last_id; -static struct workqueue_struct *binder_deferred_workqueue; #define BINDER_DEBUG_ENTRY(name) \ static int binder_##name##_open(struct inode *inode, struct file *file) \ @@ -3227,7 +3226,7 @@ binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer) if (hlist_unhashed(&proc->deferred_work_node)) { hlist_add_head(&proc->deferred_work_node, &binder_deferred_list); - queue_work(binder_deferred_workqueue, &binder_deferred_work); + schedule_work(&binder_deferred_work); } mutex_unlock(&binder_deferred_lock); } @@ -3679,10 +3678,6 @@ static int __init binder_init(void) { int ret; - binder_deferred_workqueue = create_singlethread_workqueue("binder"); - if (!binder_deferred_workqueue) - return -ENOMEM; - binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL); if (binder_debugfs_dir_entry_root) binder_debugfs_dir_entry_proc = debugfs_create_dir("proc", -- 2.20.1