--- zzzz-none-000/linux-4.1.52/kernel/locking/semaphore.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/kernel/locking/semaphore.c	2022-03-02 11:37:13.000000000 +0000
@@ -32,6 +32,9 @@
 #include <linux/semaphore.h>
 #include <linux/spinlock.h>
 #include <linux/ftrace.h>
+#if defined(CONFIG_AVM_FASTIRQ)
+#include  <asm/avm_enh/avm_fiq_os.h>
+#endif/*--- #if defined(CONFIG_AVM_FASTIRQ) ---*/
 
 static noinline void __down(struct semaphore *sem);
 static noinline int __down_interruptible(struct semaphore *sem);