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

Avi Kivity
2007-03-01T11:58:08Z

Mathiasen, Torben wrote:
>> 10 char Non-serial mice, misc features
>> nnn = /dev/kvm kernel-based virtual machine (hardware
>> virtualization extensions)
>>
>>
>
> Major 10, minor 256 has been assigned to /dev/kvm. Let me know if this is nok okay.
>
>

It doesn't work. The culprit appears to be

drivers/char/misc.c:

register_chrdev(MISC_MAJOR,"misc",&misc_fops)

which in turn means:

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.

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