--- linux-4.9.9-gentoo/include/linux/printk.h	2016-12-11 20:17:54.000000000 +0100
+++ linux-4.9.11-gentoo/include/linux/printk.h	2017-02-19 19:09:11.840179914 +0100
@@ -124,7 +124,7 @@
 })
 
 #ifdef CONFIG_EARLY_PRINTK
-extern asmlinkage __printf(1, 2)
+asmlinkage  __printf(1, 2)
 void early_printk(const char *fmt, ...);
 #else
 static inline __printf(1, 2) __cold
@@ -255,7 +255,7 @@
 }
 #endif
 
-extern asmlinkage void dump_stack(void) __cold;
+asmlinkage void dump_stack(void) __cold;
 
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt