centos man page for clear_user

CLEAR_USER(9)						    Memory Management in Linux						     CLEAR_USER(9)

NAME
       clear_user - Zero a block of memory in user space.

SYNOPSIS
       unsigned long clear_user(void __user * to, unsigned long n);

ARGUMENTS
       to
	   Destination address, in user space.

       n
	   Number of bytes to zero.

DESCRIPTION
       Zero a block of memory in user space.

       Returns number of bytes that could not be cleared. On success, this will be zero.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							     CLEAR_USER(9)