--- zzzz-none-000/linux-5.4.213/arch/arm/kernel/smp.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/arch/arm/kernel/smp.c	2024-08-14 09:01:27.000000000 +0000
@@ -52,6 +52,12 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/ipi.h>
 
+#if defined(CONFIG_AVM_FASTIRQ)
+/* necessary for avm_trigger_all_cpu_backtrace */
+#include <asm/avm_enh/avm_fiq.h>
+#include <avm/rte/ipi.h>
+#endif
+
 /*
  * as from 2.5, kernels no longer have an init_tasks structure
  * so we need some other way of telling a new secondary core
@@ -540,6 +546,9 @@
 
 		seq_printf(p, " %s\n", ipi_types[i]);
 	}
+#if defined(CONFIG_AVM_FASTIRQ)
+	avm_rte_ipi_show_list(p, prec, false);
+#endif
 }
 
 u64 smp_irq_stat_cpu(unsigned int cpu)
@@ -690,8 +699,14 @@
 		break;
 
 	default:
+#if defined(CONFIG_AVM_FASTIRQ)
+		if (avm_rte_ipi_handle(ipinr, regs) != IRQ_HANDLED)
+			pr_crit("CPU%u: Unknown IPI message 0x%x\n",
+					cpu, ipinr);
+#else
 		pr_crit("CPU%u: Unknown IPI message 0x%x\n",
-		        cpu, ipinr);
+			cpu, ipinr);
+#endif
 		break;
 	}
 
@@ -805,12 +820,18 @@
 
 #endif
 
+#if !defined(CONFIG_AVM_FASTIRQ)
 static void raise_nmi(cpumask_t *mask)
 {
 	__smp_cross_call(mask, IPI_CPU_BACKTRACE);
 }
+#endif
 
 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
 {
+#if defined(CONFIG_AVM_FASTIRQ)
+	(void)avm_trigger_all_cpu_backtrace(NULL, NULL);
+#else
 	nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_nmi);
+#endif
 }