Messages in this thread | | | Date | Thu, 1 Mar 2007 14:03:07 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: minor device number request for /dev/kvm (kernel-based virtual machine) |
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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
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