--- zzzz-none-000/linux-3.18.24/arch/mips/include/asm/fpu_emulator.h	2015-10-31 20:39:51.000000000 +0000
+++ rtl96-5690pro-762/linux-3.18.24/arch/mips/include/asm/fpu_emulator.h	2024-08-14 08:36:36.000000000 +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 {
@@ -65,6 +66,20 @@
 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 do_dsemulret(struct pt_regs *xcp)
+{
+	return 0;	/* 0 means error, should never get here anyway */
+}
+
+static inline int fpu_emulator_cop1Handler(struct pt_regs *xcp,
+				struct mips_fpu_struct *ctx, int has_fpu,
+					   void *__user *fault_addr)
+{
+	return SIGILL;	/* we don't speak MIPS FPU */
+}
+#endif	/* CONFIG_MIPS_FPU_EMULATOR */
+
 int process_fpemu_return(int sig, void __user *fault_addr);
 int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
 		     unsigned long *contpc);