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 4.8.                 January 2017                             FOLLOW_PFN(9)