The commit 
bae1d8f19983fbfa25559aa3cb6a81a84aa82a18 (linux-next)
  "irq_domain/powerpc: Use common irq_domain structure instead of irq_host"
made this change:
   -static struct irq_host *flipper_irq_host;
   +static struct irq_domain *flipper_irq_host;
and this change:
   -static struct irq_host *hlwd_irq_host;
   +static struct irq_domain *hlwd_irq_host;
The intent was to change the type, and not the name, but then in a
couple of instances, it looks like the sed to change the irq_domain_ops
name inadvertently also changed the irq_host name where it was not
supposed to, causing build failures.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
 
 unsigned int flipper_pic_get_irq(void)
 {
-       void __iomem *io_base = flipper_irq_domain->host_data;
+       void __iomem *io_base = flipper_irq_host->host_data;
        int irq;
        u32 irq_status;
 
                return NO_IRQ;  /* no more IRQs pending */
 
        irq = __ffs(irq_status);
-       return irq_linear_revmap(flipper_irq_domain, irq);
+       return irq_linear_revmap(flipper_irq_host, irq);
 }
 
 /*
        np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-pic");
        BUG_ON(!np);
 
-       flipper_irq_domain = flipper_pic_init(np);
+       flipper_irq_host = flipper_pic_init(np);
        BUG_ON(!flipper_irq_host);
 
        irq_set_default_host(flipper_irq_host);
 
 
 unsigned int hlwd_pic_get_irq(void)
 {
-       return __hlwd_pic_get_irq(hlwd_irq_domain);
+       return __hlwd_pic_get_irq(hlwd_irq_host);
 }
 
 /*
                        irq_set_handler_data(cascade_virq, host);
                        irq_set_chained_handler(cascade_virq,
                                                hlwd_pic_irq_cascade);
-                       hlwd_irq_domain = host;
+                       hlwd_irq_host = host;
                        break;
                }
        }
  */
 void hlwd_quiesce(void)
 {
-       void __iomem *io_base = hlwd_irq_domain->host_data;
+       void __iomem *io_base = hlwd_irq_host->host_data;
 
        __hlwd_quiesce(io_base);
 }