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Date: Sun, 8 Oct 2023 02:20:52 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Xie Yongji <xieyongji@...edance.com>
Subject: Re: [PATCH] vduse: make vduse_class constant
On Fri, Oct 06, 2023 at 04:30:44PM +0200, Greg Kroah-Hartman wrote:
> Now that the driver core allows for struct class to be in read-only
> memory, we should make all 'class' structures declared at build time
> placing them into read-only memory, instead of having to be dynamically
> allocated at runtime.
>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Cc: Xie Yongji <xieyongji@...edance.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Greg should I merge it or do you intend to merge all these patches?
> ---
> drivers/vdpa/vdpa_user/vduse_dev.c | 40 ++++++++++++++++--------------
> 1 file changed, 21 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index df7869537ef1..0ddd4b8abecb 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -134,7 +134,6 @@ static DEFINE_MUTEX(vduse_lock);
> static DEFINE_IDR(vduse_idr);
>
> static dev_t vduse_major;
> -static struct class *vduse_class;
> static struct cdev vduse_ctrl_cdev;
> static struct cdev vduse_cdev;
> static struct workqueue_struct *vduse_irq_wq;
> @@ -1528,6 +1527,16 @@ static const struct kobj_type vq_type = {
> .default_groups = vq_groups,
> };
>
> +static char *vduse_devnode(const struct device *dev, umode_t *mode)
> +{
> + return kasprintf(GFP_KERNEL, "vduse/%s", dev_name(dev));
> +}
> +
> +static const struct class vduse_class = {
> + .name = "vduse",
> + .devnode = vduse_devnode,
> +};
> +
> static void vduse_dev_deinit_vqs(struct vduse_dev *dev)
> {
> int i;
> @@ -1638,7 +1647,7 @@ static int vduse_destroy_dev(char *name)
> mutex_unlock(&dev->lock);
>
> vduse_dev_reset(dev);
> - device_destroy(vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
> + device_destroy(&vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
> idr_remove(&vduse_idr, dev->minor);
> kvfree(dev->config);
> vduse_dev_deinit_vqs(dev);
> @@ -1805,7 +1814,7 @@ static int vduse_create_dev(struct vduse_dev_config *config,
>
> dev->minor = ret;
> dev->msg_timeout = VDUSE_MSG_DEFAULT_TIMEOUT;
> - dev->dev = device_create_with_groups(vduse_class, NULL,
> + dev->dev = device_create_with_groups(&vduse_class, NULL,
> MKDEV(MAJOR(vduse_major), dev->minor),
> dev, vduse_dev_groups, "%s", config->name);
> if (IS_ERR(dev->dev)) {
> @@ -1821,7 +1830,7 @@ static int vduse_create_dev(struct vduse_dev_config *config,
>
> return 0;
> err_vqs:
> - device_destroy(vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
> + device_destroy(&vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
> err_dev:
> idr_remove(&vduse_idr, dev->minor);
> err_idr:
> @@ -1934,11 +1943,6 @@ static const struct file_operations vduse_ctrl_fops = {
> .llseek = noop_llseek,
> };
>
> -static char *vduse_devnode(const struct device *dev, umode_t *mode)
> -{
> - return kasprintf(GFP_KERNEL, "vduse/%s", dev_name(dev));
> -}
> -
> struct vduse_mgmt_dev {
> struct vdpa_mgmt_dev mgmt_dev;
> struct device dev;
> @@ -2082,11 +2086,9 @@ static int vduse_init(void)
> int ret;
> struct device *dev;
>
> - vduse_class = class_create("vduse");
> - if (IS_ERR(vduse_class))
> - return PTR_ERR(vduse_class);
> -
> - vduse_class->devnode = vduse_devnode;
> + ret = class_register(&vduse_class);
> + if (ret)
> + return ret;
>
> ret = alloc_chrdev_region(&vduse_major, 0, VDUSE_DEV_MAX, "vduse");
> if (ret)
> @@ -2099,7 +2101,7 @@ static int vduse_init(void)
> if (ret)
> goto err_ctrl_cdev;
>
> - dev = device_create(vduse_class, NULL, vduse_major, NULL, "control");
> + dev = device_create(&vduse_class, NULL, vduse_major, NULL, "control");
> if (IS_ERR(dev)) {
> ret = PTR_ERR(dev);
> goto err_device;
> @@ -2141,13 +2143,13 @@ static int vduse_init(void)
> err_wq:
> cdev_del(&vduse_cdev);
> err_cdev:
> - device_destroy(vduse_class, vduse_major);
> + device_destroy(&vduse_class, vduse_major);
> err_device:
> cdev_del(&vduse_ctrl_cdev);
> err_ctrl_cdev:
> unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX);
> err_chardev_region:
> - class_destroy(vduse_class);
> + class_unregister(&vduse_class);
> return ret;
> }
> module_init(vduse_init);
> @@ -2159,10 +2161,10 @@ static void vduse_exit(void)
> destroy_workqueue(vduse_irq_bound_wq);
> destroy_workqueue(vduse_irq_wq);
> cdev_del(&vduse_cdev);
> - device_destroy(vduse_class, vduse_major);
> + device_destroy(&vduse_class, vduse_major);
> cdev_del(&vduse_ctrl_cdev);
> unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX);
> - class_destroy(vduse_class);
> + class_unregister(&vduse_class);
> }
> module_exit(vduse_exit);
>
> --
> 2.42.0
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