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