linux-kernel - Re: [PATCH] accel: make accel_class a static const structure

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Message-ID: <CAFCwf11fOZpzh5ZTizzW6ZnnvEbq4oG3upp9CNmstSZj5P4ofw@mail.gmail.com>
Date:   Mon, 3 Jul 2023 15:27:25 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Tomer Tayar <ttayar@...ana.ai>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ivan Orlov <ivan.orlov0322@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] accel: make accel_class a static const structure

On Mon, Jul 3, 2023 at 3:09 PM Tomer Tayar <ttayar@...ana.ai> wrote:
>
> On 20/06/2023 21:25, Greg Kroah-Hartman wrote:
> > From: Ivan Orlov <ivan.orlov0322@...il.com>
> >
> > Now that the driver core allows for struct class to be in read-only
> > memory, move the accel_class structure to be declared at build time
> > placing it into read-only memory, instead of having to be dynamically
> > allocated at boot time.
> >
> > Cc: Oded Gabbay <ogabbay@...nel.org>
> > Cc: dri-devel@...ts.freedesktop.org
> > Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
> Reviewed-by: Tomer Tayar <ttayar@...ana.ai>
Thanks Tomer.
Applied to habanalabs-next for 6.6.
Oded
>
> Thanks,
> Tomer
>
> > ---
> >   drivers/accel/drm_accel.c | 21 ++++++++-------------
> >   1 file changed, 8 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
> > index 4a9baf02439e..2dc187e1ee41 100644
> > --- a/drivers/accel/drm_accel.c
> > +++ b/drivers/accel/drm_accel.c
> > @@ -21,7 +21,6 @@ static DEFINE_SPINLOCK(accel_minor_lock);
> >   static struct idr accel_minors_idr;
> >
> >   static struct dentry *accel_debugfs_root;
> > -static struct class *accel_class;
> >
> >   static struct device_type accel_sysfs_device_minor = {
> >       .name = "accel_minor"
> > @@ -32,23 +31,19 @@ static char *accel_devnode(const struct device *dev, umode_t *mode)
> >       return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
> >   }
> >
> > +static const struct class accel_class = {
> > +     .name = "accel",
> > +     .devnode = accel_devnode,
> > +};
> > +
> >   static int accel_sysfs_init(void)
> >   {
> > -     accel_class = class_create("accel");
> > -     if (IS_ERR(accel_class))
> > -             return PTR_ERR(accel_class);
> > -
> > -     accel_class->devnode = accel_devnode;
> > -
> > -     return 0;
> > +     return class_register(&accel_class);
> >   }
> >
> >   static void accel_sysfs_destroy(void)
> >   {
> > -     if (IS_ERR_OR_NULL(accel_class))
> > -             return;
> > -     class_destroy(accel_class);
> > -     accel_class = NULL;
> > +     class_unregister(&accel_class);
> >   }
> >
> >   static int accel_name_info(struct seq_file *m, void *data)
> > @@ -116,7 +111,7 @@ void accel_debugfs_init(struct drm_minor *minor, int minor_id)
> >   void accel_set_device_instance_params(struct device *kdev, int index)
> >   {
> >       kdev->devt = MKDEV(ACCEL_MAJOR, index);
> > -     kdev->class = accel_class;
> > +     kdev->class = &accel_class;
> >       kdev->type = &accel_sysfs_device_minor;
> >   }
> >
>
>