__copy_to_user_inatomic man page on Scientific

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

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

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

ARGUMENTS
       to
	   Destination address, in user space.

       from
	   Source address, in kernel space.

       n
	   Number of bytes to copy.

CONTEXT
       User context only.

DESCRIPTION
       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 donĀ“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.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013	       __COPY_TO_USER_INATO(9)
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