For miscdevices, the major device_no is same, so the minor device_no should be
set to ditinguish different misc devices; if not set the minor, it may fail
while insmod due to the default minor value, 0, has been used by other
miscdevice. MISC_DYNAMIC_MINOR means to let Linux kernel dynamically
For miscdevices, the major device_no is same, so the minor device_no should be
set to ditinguish different misc devices; if not set the minor, it may fail
while insmod due to the default minor value, 0, has been used by other
miscdevice. MISC_DYNAMIC_MINOR means to let Linux kernel dynamically
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