HACK: Try bring up kexec

arch/arm64/Kconfig

@@ -1078,8 +1078,13 @@ config PARAVIRT_TIME_ACCOUNTING
 
 	  If in doubt, say N here.
 
+config KEXEC_HACK
+	bool "kexec hack"
+	help
+	  Do some ad-hoc patching to SMP-related code so that kexec works.
+
 config KEXEC
-	depends on PM_SLEEP_SMP
+	depends on (PM_SLEEP_SMP || KEXEC_HACK)
 	select KEXEC_CORE
 	bool "kexec system call"
 	help

arch/arm64/kernel/smp.c

@@ -1126,7 +1126,10 @@ static bool have_cpu_die(void)
 
 bool cpus_are_stuck_in_kernel(void)
 {
+#ifndef CONFIG_KEXEC_HACK
 	bool smp_spin_tables = (num_possible_cpus() > 1 && !have_cpu_die());
-
 	return !!cpus_stuck_in_kernel || smp_spin_tables;
+#else
+	return false;
+#endif
 }

arch/arm64/kernel/smp_spin_table.c

@@ -49,6 +49,10 @@ static int smp_spin_table_cpu_init(unsigned int cpu)
 	if (!dn)
 		return -ENODEV;
 
+#ifdef CONFIG_KEXEC_HACK
+	return -ENOSYS;
+#endif
+
 	/*
 	 * Determine the address from which the CPU is polling.
 	 */