'\" t
.\"     Title: __clear_user
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Memory Management in Linux
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "__CLEAR_USER" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Memory Management in Linux"
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.SH "NAME"
__clear_user \- Zero a block of memory in user space, with less checking\&.
.SH "SYNOPSIS"
.HP \w'unsigned\ long\ __clear_user('u
.BI "unsigned long __clear_user(void\ __user\ *\ " "to" ", unsigned\ long\ " "n" ");"
.SH "ARGUMENTS"
.PP
\fIto\fR
.RS 4
Destination address, in user space\&.
.RE
.PP
\fIn\fR
.RS 4
Number of bytes to zero\&.
.RE
.SH "DESCRIPTION"
.PP
Zero a block of memory in user space\&. Caller must check the specified block with
\fBaccess_ok\fR
before calling this function\&.
.PP
Returns number of bytes that could not be cleared\&. On success, this will be zero\&.
.SH "COPYRIGHT"
.br