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vm_insert_page
Langue: en
Version: October 2010 (fedora - 01/12/10)
Section: 9 (Appels noyau Linux)
NAME
vm_insert_page - insert single page into user vmaSYNOPSIS
- int vm_insert_page(struct vm_area_struct * vma, unsigned long addr, struct page * page);
ARGUMENTS
vma
- user vma to map to
addr
- target user address of this page
page
- source kernel page
DESCRIPTION
This allows drivers to insert individual pages they've allocated into a user vma.
The page has to be a nice clean _individual_ kernel allocation. If you allocate a compound page, you need to have marked it as such (__GFP_COMP), or manually just split the page up yourself (see split_page).
NOTE! Traditionally this was done with lqremap_pfn_rangerq which took an arbitrary page protection parameter. This doesn't allow that. Your vma protection will have to be set up correctly, which means that if you want a shared writable mapping, you'd better ask for a shared writable mapping!
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