--- zzzz-none-000/linux-4.9.276/arch/mips/include/asm/fpu_emulator.h	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/arch/mips/include/asm/fpu_emulator.h	2023-04-05 08:19:00.000000000 +0000
@@ -30,6 +30,7 @@
 #include <asm/local.h>
 #include <asm/processor.h>
 
+#ifdef CONFIG_MIPS_FPU_EMULATOR
 #ifdef CONFIG_DEBUG_FS
 
 struct mips_fpu_emulator_stats {
@@ -63,6 +64,16 @@
 extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
 				    struct mips_fpu_struct *ctx, int has_fpu,
 				    void *__user *fault_addr);
+#else /* no CONFIG_MIPS_FPU_EMULATOR */
+static inline int fpu_emulator_cop1Handler(struct pt_regs *xcp,
+					   struct mips_fpu_struct *ctx, int has_fpu,
+					   void *__user *fault_addr)
+{
+	*fault_addr = NULL;
+	return SIGILL; /* we don't speak MIPS FPU */
+}
+#endif /* CONFIG_MIPS_FPU_EMULATOR */
+
 void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
 		     struct task_struct *tsk);
 int process_fpemu_return(int sig, void __user *fault_addr,