follow_pfn (9) Linux Manual Page
follow_pfn – look up PFN at a user virtual address
Synopsis
int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn);Arguments
vma
-
- memory mapping
address
- user virtual address
pfn
- location to store found PFN
Description
Only IO mappings and raw PFN mappings are allowed.
Returns zero and the pfn at pfn on success, -ve otherwise.