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

[Avi Kivity]

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

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