static vm_fault_t dev_dax_huge_fault()

in device.c [231:261]

• 27 lines of code
• 5 McCabe index (conditional complexity)

static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
		enum page_entry_size pe_size)
{
	struct file *filp = vmf->vma->vm_file;
	vm_fault_t rc = VM_FAULT_SIGBUS;
	int id;
	struct dev_dax *dev_dax = filp->private_data;

	dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm,
			(vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
			vmf->vma->vm_start, vmf->vma->vm_end, pe_size);

	id = dax_read_lock();
	switch (pe_size) {
	case PE_SIZE_PTE:
		rc = __dev_dax_pte_fault(dev_dax, vmf);
		break;
	case PE_SIZE_PMD:
		rc = __dev_dax_pmd_fault(dev_dax, vmf);
		break;
	case PE_SIZE_PUD:
		rc = __dev_dax_pud_fault(dev_dax, vmf);
		break;
	default:
		rc = VM_FAULT_SIGBUS;
	}

	dax_read_unlock(id);

	return rc;
}