Name
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
struct vm_area_struct * vma
memory mapping
unsigned long address
user virtual address
unsigned long * 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.