FOLLOW_PFN(9) Memory Management in Linux FOLLOW_PFN(9)
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 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.
COPYRIGHT Kernel Hackers Manual 2.6. November 2011 FOLLOW_PFN(9)