__clear_user - Zero a block of memory in user space, with less checking.
"unsigned long __clear_user(void __user * " "to" ", unsigned long " "n" ");"
to
Destination address, in user space.nNumber of bytes to zero.
Zero a block of memory in user space. Caller must check the specified block with access_okfR
before calling this function.Returns number of bytes that could not be cleared. On success, this will be zero.
