1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 0efdb1dfdc5f..11d1fc3a8962 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -110,6 +110,10 @@ struct machdep_calls {
         void            (*show_percpuinfo)(struct seq_file *m, int i);
 
         void            (*init_IRQ)(void);
+
+        /* Return an irq, or NO_IRQ to indicate there are none pending.
+         * If for some reason there is no irq, but the interrupt
+         * shouldn't be counted as spurious, return NO_IRQ_IGNORE. */
         unsigned int    (*get_irq)(void);
 #ifdef CONFIG_KEXEC
         void            (*kexec_cpu_down)(int crash_shutdown, int secondary);