Simplify the startup of the cleaner, reaper and update threads by

passing the main function directly to kthread_create(9). The start_*
functions are mere stepping stones nowadays and can be pruned.
They used to contain more logic in the pre-kthread era.

While here, set `cleanerproc' and `syncerproc' during the thread
creation rather than expect the threads to set the proc pointer.
Also, rename `sched_sync' to `syncer_thread' to reduce confusion
with the scheduler-related functions.

OK kettenis@, deraadt@, mpi@

7 files changed, 18 insertions, 45 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 397d8f8f2a6..aa4c0a83ef7 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: init_main.c,v 1.279 2018/07/20 21:57:26 deraadt Exp $	*/
+/*	$OpenBSD: init_main.c,v 1.280 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: init_main.c,v 1.84.4.1 1996/06/02 09:08:06 mrg Exp $	*/
 
 /*
@@ -137,9 +137,6 @@ long	__guard_local __attribute__((section(".openbsd.randomdata")));
 int	main(void *);
 void	check_console(struct proc *);
 void	start_init(void *);
-void	start_cleaner(void *);
-void	start_update(void *);
-void	start_reaper(void *);
 void	crypto_init(void);
 void	db_ctf_init(void);
 void	prof_init(void);
@@ -524,15 +521,15 @@ main(void *framep)
 		panic("fork pagedaemon");
 
 	/* Create the reaper daemon kernel thread. */
-	if (kthread_create(start_reaper, NULL, &reaperproc, "reaper"))
+	if (kthread_create(reaper, NULL, &reaperproc, "reaper"))
 		panic("fork reaper");
 
 	/* Create the cleaner daemon kernel thread. */
-	if (kthread_create(start_cleaner, NULL, NULL, "cleaner"))
+	if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner"))
 		panic("fork cleaner");
 
 	/* Create the update daemon kernel thread. */
-	if (kthread_create(start_update, NULL, NULL, "update"))
+	if (kthread_create(syncer_thread, NULL, &syncerproc, "update"))
 		panic("fork update");
 
 	/* Create the aiodone daemon kernel thread. */ 
@@ -745,24 +742,3 @@ start_init(void *arg)
 	printf("init: not found\n");
 	panic("no init");
 }
-
-void
-start_update(void *arg)
-{
-	sched_sync(curproc);
-	/* NOTREACHED */
-}
-
-void
-start_cleaner(void *arg)
-{
-	buf_daemon(curproc);
-	/* NOTREACHED */
-}
-
-void
-start_reaper(void *arg)
-{
-	reaper();
-	/* NOTREACHED */
-}
diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 6bbf5fb2258..4e1f1dee000 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_exit.c,v 1.165 2018/07/13 09:25:23 beck Exp $	*/
+/*	$OpenBSD: kern_exit.c,v 1.166 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: kern_exit.c,v 1.39 1996/04/22 01:38:25 christos Exp $	*/
 
 /*
@@ -376,7 +376,7 @@ proc_free(struct proc *p)
  * a zombie, and the parent is allowed to read the undead's status.
  */
 void
-reaper(void)
+reaper(void *arg)
 {
 	struct proc *p;
 
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index fc8896f1292..3dcac1eb121 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vfs_bio.c,v 1.185 2017/08/27 01:59:30 beck Exp $	*/
+/*	$OpenBSD: vfs_bio.c,v 1.186 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: vfs_bio.c,v 1.44 1996/06/11 11:15:36 pk Exp $	*/
 
 /*
@@ -1158,13 +1158,11 @@ buf_get(struct vnode *vp, daddr_t blkno, size_t size)
  * Buffer cleaning daemon.
  */
 void
-buf_daemon(struct proc *p)
+buf_daemon(void *arg)
 {
 	struct buf *bp = NULL;
 	int s, pushed = 0;
 
-	cleanerproc = curproc;
-
 	s = splbio();
 	for (;;) {
 		if (bp == NULL || (pushed >= 16 &&
diff --git a/sys/kern/vfs_sync.c b/sys/kern/vfs_sync.c
index 1e8fe91ccdc..ece99ea9a76 100644
--- a/sys/kern/vfs_sync.c
+++ b/sys/kern/vfs_sync.c
@@ -1,4 +1,4 @@
-/*       $OpenBSD: vfs_sync.c,v 1.59 2018/05/27 06:02:14 visa Exp $  */
+/*       $OpenBSD: vfs_sync.c,v 1.60 2018/08/13 15:26:17 visa Exp $  */
 
 /*
  *  Portions of this code are:
@@ -133,15 +133,14 @@ vn_syncer_add_to_worklist(struct vnode *vp, int delay)
  * System filesystem synchronizer daemon.
  */
 void
-sched_sync(struct proc *p)
+syncer_thread(void *arg)
 {
+	struct proc *p = curproc;
 	struct synclist *slp;
 	struct vnode *vp;
 	time_t starttime;
 	int s;
 
-	syncerproc = curproc;
-
 	for (;;) {
 		starttime = time_second;
 
@@ -183,7 +182,7 @@ sched_sync(struct proc *p)
 					if (vp->v_mount != NULL)
 						printf("mounted on: %s\n",
 						    vp->v_mount->mnt_stat.f_mntonname);
-					panic("sched_sync: fsync failed");
+					panic("%s: fsync failed", __func__);
 				}
 #endif /* DIAGNOSTIC */
 				/*
diff --git a/sys/sys/buf.h b/sys/sys/buf.h
index 3805a7a35fa..b468a9ef883 100644
--- a/sys/sys/buf.h
+++ b/sys/sys/buf.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: buf.h,v 1.106 2017/04/16 14:25:42 beck Exp $	*/
+/*	$OpenBSD: buf.h,v 1.107 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: buf.h,v 1.25 1997/04/09 21:12:17 mycroft Exp $	*/
 
 /*
@@ -320,7 +320,7 @@ void  reassignbuf(struct buf *);
 void  bgetvp(struct vnode *, struct buf *);
 
 void  buf_replacevnode(struct buf *, struct vnode *);
-void  buf_daemon(struct proc *);
+void  buf_daemon(void *);
 void  buf_replacevnode(struct buf *, struct vnode *);
 int bread_cluster(struct vnode *, daddr_t, int, struct buf **);
 
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index 6f088a5b67d..63aca571c3b 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: proc.h,v 1.255 2018/08/05 14:23:57 beck Exp $	*/
+/*	$OpenBSD: proc.h,v 1.256 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: proc.h,v 1.44 1996/04/22 01:23:21 christos Exp $	*/
 
 /*-
@@ -535,7 +535,7 @@ void	resetpriority(struct proc *);
 void	setrunnable(struct proc *);
 void	endtsleep(void *);
 void	unsleep(struct proc *);
-void	reaper(void);
+void	reaper(void *);
 void	exit1(struct proc *, int, int);
 void	exit2(struct proc *);
 int	dowait4(struct proc *, pid_t, int *, int, struct rusage *,
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 404a50b05e2..44ed35962f8 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vnode.h,v 1.147 2018/07/13 09:25:23 beck Exp $	*/
+/*	$OpenBSD: vnode.h,v 1.148 2018/08/13 15:26:17 visa Exp $	*/
 /*	$NetBSD: vnode.h,v 1.38 1996/02/29 20:59:05 cgd Exp $	*/
 
 /*
@@ -641,7 +641,7 @@ int	vn_ioctl(struct file *, u_long, caddr_t, struct proc *);
 void	vn_marktext(struct vnode *);
 
 /* vfs_sync.c */
-void	sched_sync(struct proc *);
+void	syncer_thread(void *);
 void	vn_initialize_syncerd(void);
 void	vn_syncer_add_to_worklist(struct vnode *, int);