用户缓冲区太小。
Now the data is stored in the user address space buffer.
现在数据被储存在用户地址空间缓冲区。
A warning is printed to the user if a buffer wrap condition has occurred.
如果发生了缓冲区回绕，就向用户输出警告。
The copy_from_user function copies a block of data from user space into a kernel buffer.
copy _ from_user函数将数据块从用户空间复制到内核缓冲区。
The copy_from_user function copies a block of data from user space into a kernel buffer.
copy _ from_user函数将数据块从用户空间复制到内核缓冲区。
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