__copy_from_user man page on Oracle

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__COPY_FROM_USER(9)	  Memory Management in Linux	   __COPY_FROM_USER(9)

       __copy_from_user - Copy a block of data from user space, with less

       unsigned long __copy_from_user(void * to, const void __user * from,
				      unsigned long n);

	   Destination address, in kernel space.

	   Source address, in user space.

	   Number of bytes to copy.

       User context only. This function may sleep.

       Copy data from user space to kernel space. Caller must check the
       specified block with access_ok before calling this function.

       Returns number of bytes that could not be copied. On success, this will
       be zero.

       If some data could not be copied, this function will pad the copied
       data to the requested size using zero bytes.

       An alternate version - __copy_from_user_inatomic - may be called from
       atomic context and will fail rather than sleep. In this case the
       uncopied bytes will *NOT* be padded with zeros. See fs/filemap.h for
       explanation of why this is needed.

Kernel Hackers Manual 3.8.	   June 2014		   __COPY_FROM_USER(9)

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