1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>vm_insert_page</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch04s03.html" title="More Memory Management Functions"><link rel="prev" href="API-zap-vma-ptes.html" title="zap_vma_ptes"><link rel="next" href="API-vm-insert-pfn.html" title="vm_insert_pfn"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">vm_insert_page</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-zap-vma-ptes.html">Prev</a> </td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-vm-insert-pfn.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-vm-insert-page"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>vm_insert_page — 2 insert single page into user vma 3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">vm_insert_page </b>(</code></td><td>struct vm_area_struct * <var class="pdparam">vma</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">addr</var>, </td></tr><tr><td> </td><td>struct page * <var class="pdparam">page</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp1124275804"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>vma</code></em></span></dt><dd><p> 4 user vma to map to 5 </p></dd><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p> 6 target user address of this page 7 </p></dd><dt><span class="term"><em class="parameter"><code>page</code></em></span></dt><dd><p> 8 source kernel page 9 </p></dd></dl></div></div><div class="refsect1"><a name="idp1124279460"></a><h2>Description</h2><p> 10 This allows drivers to insert individual pages they've allocated 11 into a user vma. 12 </p><p> 13 14 The page has to be a nice clean _individual_ kernel allocation. 15 If you allocate a compound page, you need to have marked it as 16 such (__GFP_COMP), or manually just split the page up yourself 17 (see <code class="function">split_page</code>). 18 </p><p> 19 20 NOTE! Traditionally this was done with <span class="quote">“<span class="quote"><code class="function">remap_pfn_range</code></span>”</span> which 21 took an arbitrary page protection parameter. This doesn't allow 22 that. Your vma protection will have to be set up correctly, which 23 means that if you want a shared writable mapping, you'd better 24 ask for a shared writable mapping! 25 </p><p> 26 27 The page does not need to be reserved. 28 </p><p> 29 30 Usually this function is called from f_op-><code class="function">mmap</code> handler 31 under mm->mmap_sem write-lock, so it can change vma->vm_flags. 32 Caller must set VM_MIXEDMAP on vma if it wants to call this 33 function from other places, for example from page-fault handler. 34</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-zap-vma-ptes.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-vm-insert-pfn.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">zap_vma_ptes</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">vm_insert_pfn</span></td></tr></table></div></body></html> 35