1 files changed, 1 insertions, 1 deletions

diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index 71c6e7eb2a26..cc7c17f16a9a 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -99,7 +99,7 @@ struct machdep_calls {
 #endif /* CONFIG_PPC64 */
 
         int             (*probe)(void);
-        void            (*setup_arch)(void);
+        void            (*setup_arch)(void); /* Optional, may be NULL */
         void            (*init_early)(void);
         /* Optional, may be NULL. */
         void            (*show_cpuinfo)(struct seq_file *m);