Man page 9 : zap_vma_ptes

zap_vma_ptes - remove ptes mapping the vma

int zap_vma_ptes(struct vm_area_struct *  vma , unsigned long  address , unsigned long  size );

vma
    vm_area_struct holding ptes to be zapped

address
    starting address of pages to zap

size
    number of bytes to zap

This function only unmaps ptes assigned to VM_PFNMAP vmas.

The entire address range must be fully contained within the vma.

Returns 0 if successful.