diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
index 61727785a247..dcd6a75277d1 100644
--- a/arch/mips/include/asm/bootinfo.h
+++ b/arch/mips/include/asm/bootinfo.h
@@ -121,7 +121,7 @@ extern unsigned long fw_passed_dtb;
 #endif
 
 /*
- * Platform memory detection hook called by setup_arch
+ * Platform memory detection hook called by arch_mem_init()
  */
 extern void plat_mem_setup(void);
 
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index b1e2d4360383..5481a0c68521 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -654,8 +654,6 @@ static void __init bootcmdline_init(char **cmdline_p)
  */
 static void __init arch_mem_init(char **cmdline_p)
 {
-	extern void plat_mem_setup(void);
-
 	/* call board setup routine */
 	plat_mem_setup();
 	memblock_set_bottom_up(true);