__CLEAR_USER(9) Memory Management in Linux __CLEAR_USER(9)NAME__clear_user - Zero a block of memory in user space, with less
unsigned long __clear_user(void __user * to, unsigned long n);
Destination address, in user space.
Number of bytes to zero.
Zero a block of memory in user space. Caller must check the specified
block with access_ok before calling this function.
Returns number of bytes that could not be cleared. On success, this
will be zero.
COPYRIGHTKernel Hackers Manual 3.8. June 2014 __CLEAR_USER(9)