vm_insert_pfn_prot (9) - Linux Manuals

vm_insert_pfn_prot: insert single pfn into user vma with specified pgprot

Command to display vm_insert_pfn_prot manual in Linux: $ man 9 vm_insert_pfn_prot

NAME

vm_insert_pfn_prot - insert single pfn into user vma with specified pgprot

SYNOPSIS

int vm_insert_pfn_prot(struct vm_area_struct * vma, unsigned long addr, unsigned long pfn, pgprot_t pgprot);

ARGUMENTS

vma

: user vma to map to

addr

: target user address of this page

pfn

: source kernel pfn

pgprot

: pgprot flags for the inserted page

DESCRIPTION

This is exactly like vm_insert_pfn, except that it allows drivers to to override pgprot on a per-page basis.

This only makes sense for IO mappings, and it makes no sense for cow mappings. In general, using multiple vmas is preferable; vm_insert_pfn_prot should only be used if using multiple VMAs is impractical.