__CLEAR_USER(9)                     Memory Management in Linux                    __CLEAR_USER(9)



NAME
       __clear_user - Zero a block of memory in user space, with less checking.

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. 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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                           __CLEAR_USER(9)