diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 4050b191e1a9..6e794420bd39 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -87,10 +87,12 @@ struct bug_entry {
  *
  * Use the versions with printk format strings to provide better diagnostics.
  */
-#ifndef __WARN_FLAGS
 extern __printf(4, 5)
 void warn_slowpath_fmt(const char *file, const int line, unsigned taint,
 		       const char *fmt, ...);
+extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
+
+#ifndef __WARN_FLAGS
 #define __WARN()		__WARN_printf(TAINT_WARN, NULL)
 #define __WARN_printf(taint, arg...) do {				\
 		instrumentation_begin();				\
@@ -98,7 +100,6 @@ void warn_slowpath_fmt(const char *file, const int line, unsigned taint,
 		instrumentation_end();					\
 	} while (0)
 #else
-extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
 #define __WARN()		__WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN))
 #define __WARN_printf(taint, arg...) do {				\
 		instrumentation_begin();				\
diff --git a/include/linux/panic.h b/include/linux/panic.h
index 979b776e3bcb..6717b15e798c 100644
--- a/include/linux/panic.h
+++ b/include/linux/panic.h
@@ -32,6 +32,9 @@ extern int sysctl_panic_on_stackoverflow;
 
 extern bool crash_kexec_post_notifiers;
 
+extern void __stack_chk_fail(void);
+void abort(void);
+
 /*
  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
  * holds a CPU number which is executing panic() currently. A value of