Re: minor device number request for /dev/kvm (kernel-based virtual machine)

[Avi Kivity <avi@qumranet.com>]

Jan Engelhardt wrote:
> On Mar 1 2007 13:58, Avi Kivity wrote:
>   
>> fs/char_dev.c:
>>     
>>> int register_chrdev(unsigned int major, const char *name,
>>>            const struct file_operations *fops)
>>> {
>>> struct char_device_struct *cd;
>>> struct cdev *cdev;
>>> char *s;
>>> int err = -ENOMEM;
>>>
>>> cd = __register_chrdev_region(major, 0, 256, name);
>>>       
>> So misc minor numbers under 256 are not supported.
>>
>> What's the way out?  Increase the region size?  I don't know if that's safe.
>>     
>
> If it does not increase memory usage, then possibly:
>
>   __register_chrdev_region(major, 0, (~0U) & MINORMASK, name);
>                                   or (1<<MINORMASK)-1 if that's more clear
>
>   

I'm more worried about something in the chardev bowels not supporting 
 >8bit minors well.


-- 
error compiling committee.c: too many arguments to function