Merge tag 'for-linus-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

Pull UML updates from Richard Weinberger:

 - Move to strscpy()

 - Improve panic notifiers

 - Fix NR_CPUS usage

 - Fixes for various comments

 - Fixes for virtio driver

* tag 'for-linus-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux:
  uml: Remove the initialization of statics to 0
  um: Do not initialise statics to 0.
  um: Fix comment typo
  um: Improve panic notifiers consistency and ordering
  um: remove unused reactivate_chan() declaration
  um: mmaper: add __exit annotations to module exit funcs
  um: virt-pci: add __init/__exit annotations to module init/exit funcs
  hostfs: move from strlcpy with unused retval to strscpy
  um: move from strlcpy with unused retval to strscpy
  um: increase default virtual physical memory to 64 MiB
  UM: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK
  um: read multiple msg from virtio slave request fd

Author: torvalds

arch/um/drivers/chan.h

@@ -36,7 +36,6 @@ extern int console_write_chan(struct chan *chan, const char *buf,
 			      int len);
 extern int console_open_chan(struct line *line, struct console *co);
 extern void deactivate_chan(struct chan *chan, int irq);
-extern void reactivate_chan(struct chan *chan, int irq);
 extern void chan_enable_winch(struct chan *chan, struct tty_port *port);
 extern int enable_chan(struct line *line);
 extern void close_chan(struct line *line);

arch/um/drivers/mconsole_kern.c

@@ -283,7 +283,7 @@ struct unplugged_pages {
 };
 
 static DEFINE_MUTEX(plug_mem_mutex);
-static unsigned long long unplugged_pages_count = 0;
+static unsigned long long unplugged_pages_count;
 static LIST_HEAD(unplugged_pages);
 static int unplug_index = UNPLUGGED_PER_PAGE;
 
@@ -846,13 +846,12 @@ static int notify_panic(struct notifier_block *self, unsigned long unused1,
 
 	mconsole_notify(notify_socket, MCONSOLE_PANIC, message,
 			strlen(message) + 1);
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block panic_exit_notifier = {
-	.notifier_call 		= notify_panic,
-	.next 			= NULL,
-	.priority 		= 1
+	.notifier_call	= notify_panic,
+	.priority	= INT_MAX, /* run as soon as possible */
 };
 
 static int add_notifier(void)

arch/um/drivers/mmapper_kern.c

@@ -122,7 +122,7 @@ static int __init mmapper_init(void)
 	return 0;
 }
 
-static void mmapper_exit(void)
+static void __exit mmapper_exit(void)
 {
 	misc_deregister(&mmapper_dev);
 }

arch/um/drivers/net_kern.c

@@ -265,7 +265,7 @@ static void uml_net_poll_controller(struct net_device *dev)
 static void uml_net_get_drvinfo(struct net_device *dev,
 				struct ethtool_drvinfo *info)
 {
-	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 }
 
 static const struct ethtool_ops uml_net_ethtool_ops = {

arch/um/drivers/ssl.c

@@ -106,7 +106,7 @@ static const struct tty_operations ssl_ops = {
 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized
  * by being an initcall and exitcall, respectively.
  */
-static int ssl_init_done = 0;
+static int ssl_init_done;
 
 static void ssl_console_write(struct console *c, const char *string,
 			      unsigned len)

arch/um/drivers/stdio_console.c

@@ -88,7 +88,7 @@ static int con_remove(int n, char **error_out)
 }
 
 /* Set in an initcall, checked in an exitcall */
-static int con_init_done = 0;
+static int con_init_done;
 
 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
 {

arch/um/drivers/ubd_kern.c

@@ -1555,7 +1555,7 @@ static void do_io(struct io_thread_req *req, struct io_desc *desc)
 int kernel_fd = -1;
 
 /* Only changed by the io thread. XXX: currently unused. */
-static int io_count = 0;
+static int io_count;
 
 int io_thread(void *arg)
 {

arch/um/drivers/vector_kern.c

@@ -1372,7 +1372,7 @@ static void vector_net_poll_controller(struct net_device *dev)
 static void vector_net_get_drvinfo(struct net_device *dev,
 				struct ethtool_drvinfo *info)
 {
-	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
 }
 
 static int vector_net_load_bpf_flash(struct net_device *dev,

arch/um/drivers/virt-pci.c

@@ -857,7 +857,7 @@ void *pci_root_bus_fwnode(struct pci_bus *bus)
 	return um_pci_fwnode;
 }
 
-static int um_pci_init(void)
+static int __init um_pci_init(void)
 {
 	int err, i;
 
@@ -940,7 +940,7 @@ static int um_pci_init(void)
 }
 module_init(um_pci_init);
 
-static void um_pci_exit(void)
+static void __exit um_pci_exit(void)
 {
 	unregister_virtio_driver(&um_pci_virtio_driver);
 	irq_domain_remove(um_pci_msi_domain);

arch/um/drivers/virtio_uml.c

@@ -374,45 +374,48 @@ static irqreturn_t vu_req_read_message(struct virtio_uml_device *vu_dev,
 		u8 extra_payload[512];
 	} msg;
 	int rc;
+	irqreturn_t irq_rc = IRQ_NONE;
 
-	rc = vhost_user_recv_req(vu_dev, &msg.msg,
-				 sizeof(msg.msg.payload) +
-				 sizeof(msg.extra_payload));
-
-	vu_dev->recv_rc = rc;
-	if (rc)
-		return IRQ_NONE;
-
-	switch (msg.msg.header.request) {
-	case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG:
-		vu_dev->config_changed_irq = true;
-		response = 0;
-		break;
-	case VHOST_USER_SLAVE_VRING_CALL:
-		virtio_device_for_each_vq((&vu_dev->vdev), vq) {
-			if (vq->index == msg.msg.payload.vring_state.index) {
-				response = 0;
-				vu_dev->vq_irq_vq_map |= BIT_ULL(vq->index);
-				break;
+	while (1) {
+		rc = vhost_user_recv_req(vu_dev, &msg.msg,
+					 sizeof(msg.msg.payload) +
+					 sizeof(msg.extra_payload));
+		if (rc)
+			break;
+
+		switch (msg.msg.header.request) {
+		case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG:
+			vu_dev->config_changed_irq = true;
+			response = 0;
+			break;
+		case VHOST_USER_SLAVE_VRING_CALL:
+			virtio_device_for_each_vq((&vu_dev->vdev), vq) {
+				if (vq->index == msg.msg.payload.vring_state.index) {
+					response = 0;
+					vu_dev->vq_irq_vq_map |= BIT_ULL(vq->index);
+					break;
+				}
 			}
+			break;
+		case VHOST_USER_SLAVE_IOTLB_MSG:
+			/* not supported - VIRTIO_F_ACCESS_PLATFORM */
+		case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG:
+			/* not supported - VHOST_USER_PROTOCOL_F_HOST_NOTIFIER */
+		default:
+			vu_err(vu_dev, "unexpected slave request %d\n",
+			       msg.msg.header.request);
 		}
-		break;
-	case VHOST_USER_SLAVE_IOTLB_MSG:
-		/* not supported - VIRTIO_F_ACCESS_PLATFORM */
-	case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG:
-		/* not supported - VHOST_USER_PROTOCOL_F_HOST_NOTIFIER */
-	default:
-		vu_err(vu_dev, "unexpected slave request %d\n",
-		       msg.msg.header.request);
-	}
-
-	if (ev && !vu_dev->suspended)
-		time_travel_add_irq_event(ev);
 
-	if (msg.msg.header.flags & VHOST_USER_FLAG_NEED_REPLY)
-		vhost_user_reply(vu_dev, &msg.msg, response);
+		if (ev && !vu_dev->suspended)
+			time_travel_add_irq_event(ev);
 
-	return IRQ_HANDLED;
+		if (msg.msg.header.flags & VHOST_USER_FLAG_NEED_REPLY)
+			vhost_user_reply(vu_dev, &msg.msg, response);
+		irq_rc = IRQ_HANDLED;
+	};
+	/* mask EAGAIN as we try non-blocking read until socket is empty */
+	vu_dev->recv_rc = (rc == -EAGAIN) ? 0 : rc;
+	return irq_rc;
 }
 
 static irqreturn_t vu_req_interrupt(int irq, void *data)