--- zzzz-none-000/linux-4.4.271/arch/mips/kernel/process.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/arch/mips/kernel/process.c	2023-04-19 10:22:28.000000000 +0000
@@ -173,6 +173,62 @@
 	return 0;
 }
 
+/* Fill in the fpu structure for a core dump.. */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
+{
+	int i;
+
+	for (i = 0; i < NUM_FPU_REGS; i++)
+		memcpy(&r[i], &current->thread.fpu.fpr[i], sizeof(*r));
+
+	memcpy(&r[NUM_FPU_REGS], &current->thread.fpu.fcr31,
+	       sizeof(current->thread.fpu.fcr31));
+
+	return 1;
+}
+
+void elf_dump_regs(elf_greg_t *gp, struct pt_regs *regs)
+{
+	int i;
+
+	for (i = 0; i < EF_R0; i++)
+		gp[i] = 0;
+	gp[EF_R0] = 0;
+	for (i = 1; i <= 31; i++)
+		gp[EF_R0 + i] = regs->regs[i];
+	gp[EF_R26] = 0;
+	gp[EF_R27] = 0;
+	gp[EF_LO] = regs->lo;
+	gp[EF_HI] = regs->hi;
+	gp[EF_CP0_EPC] = regs->cp0_epc;
+	gp[EF_CP0_BADVADDR] = regs->cp0_badvaddr;
+	gp[EF_CP0_STATUS] = regs->cp0_status;
+	gp[EF_CP0_CAUSE] = regs->cp0_cause;
+#ifdef EF_UNUSED0
+	gp[EF_UNUSED0] = 0;
+#endif
+}
+EXPORT_SYMBOL_GPL(elf_dump_regs);
+
+int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
+{
+	elf_dump_regs(*regs, task_pt_regs(tsk));
+	return 1;
+}
+
+int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr)
+{
+	int i;
+
+	for (i = 0; i < NUM_FPU_REGS; i++)
+		memcpy(&fpr[i], &t->thread.fpu.fpr[i], sizeof(*fpr));
+
+	memcpy(&fpr[NUM_FPU_REGS], &t->thread.fpu.fcr31,
+	       sizeof(t->thread.fpu.fcr31));
+
+	return 1;
+}
+
 #ifdef CONFIG_CC_STACKPROTECTOR
 #include <linux/stackprotector.h>
 unsigned long __stack_chk_guard __read_mostly;
@@ -630,6 +686,7 @@
 	return sp & ALMASK;
 }
 
+#if !defined(CONFIG_AVM_ENHANCED)
 static DEFINE_PER_CPU(struct call_single_data, backtrace_csd);
 static struct cpumask backtrace_csd_busy;
 
@@ -673,6 +730,7 @@
 		smp_call_function_single_async(cpu, csd);
 	}
 }
+#endif/*--- #if !defined(CONFIG_AVM_ENHANCED) ---*/
 
 int mips_get_process_fp_mode(struct task_struct *task)
 {