__copy_to_user_inatomic - Copy a block of data into user space, with less checking.
"unsigned long __must_check __copy_to_user_inatomic(void __user * " "to" ", const void * " "from" ", unsigned long " "n" ");"
to
Destination address, in user space.fromSource address, in kernel space. n Number of bytes to copy.
User context only.
Copy data from kernel space to user space. Caller must check the specified block with access_okfR
before calling this function. The caller should also make sure he pins the user space address so that the 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.
