linux-kernel - Re: [PATCH v2] mm/hmm/test: simplify hmm test code: use miscdevice instead of char dev

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Date:   Thu, 17 Mar 2022 11:15:39 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Mika Penttilä <mpenttil@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        apopple@...dia.com, jhubbard@...dia.com, rcampbell@...dia.com,
        vbabka@...e.cz
Subject: Re: [PATCH v2] mm/hmm/test: simplify hmm test code: use miscdevice
 instead of char dev

On Thu, Mar 17, 2022 at 08:58:52AM +0200, Mika Penttilä wrote:
> @@ -1225,7 +1232,11 @@ static int dmirror_device_init(struct dmirror_device
> *mdevice, int id)
> 
>         cdev_init(&mdevice->cdevice, &dmirror_fops);
>         mdevice->cdevice.owner = THIS_MODULE;
> -       ret = cdev_add(&mdevice->cdevice, dev, 1);
> +       device_initialize(&mdevice->device);
> +       dev_set_name(&mdevice->device, "%s", dmirror_device_names[id]);
> +       mdevice->device.devt = dev;
> +
> +       ret = cdev_device_add(&mdevice->cdevice, &mdevice->device);
>         if (ret)
>                 return ret;

Right, miscdev isn't that helpful in the end..

Jason