static int simple_remap_mmap(struct file *filp, struct vm_area_struct *vma) { if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start, vma->vm_page_prot)) return -EAGAIN; vma->vm_ops = &simple_remap_vm_ops; simple_vma_open(vma); return 0; }
static int simple_nopage_mmap(struct file *filp, struct vm_area_struct *vma) { unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; if (offset >= __pa(high_memory) || (filp->f_flags & O_SYNC)) vma->vm_flags |= VM_IO; vma->vm_ops = &simple_nopage_vm_ops; simple_vma_open(vma); return 0; }