__copy_to_user_inatomic man page on Oracle

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__COPY_TO_USER_INATO(9)	  Memory Management in Linux   __COPY_TO_USER_INATO(9)

       __copy_to_user_inatomic - Copy a block of data into user space, with
       less checking.

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

	   Destination address, in user space.

	   Source address, in kernel space.

	   Number of bytes to copy.

       User context only.

       Copy data from kernel space to user space. Caller must check the
       specified block with access_ok before calling this function. The caller
       should also make sure he pins the user space address so that we don't
       result in page fault and sleep.

       Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a
       fault we return the initial request size (1, 2 or 4), as copy_*_user
       should do. If a store crosses a page boundary and gets a fault, the x86
       will not write anything, so this is accurate.

Kernel Hackers Manual 3.8.	   June 2014	       __COPY_TO_USER_INATO(9)

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