v4.19.13 snapshot.
diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
new file mode 100644
index 0000000..709a559
--- /dev/null
+++ b/arch/arm/include/asm/smp.h
@@ -0,0 +1,127 @@
+/*
+ * arch/arm/include/asm/smp.h
+ *
+ * Copyright (C) 2004-2005 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_ARM_SMP_H
+#define __ASM_ARM_SMP_H
+
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/thread_info.h>
+
+#ifndef CONFIG_SMP
+# error "<asm/smp.h> included in non-SMP build"
+#endif
+
+#define raw_smp_processor_id() (current_thread_info()->cpu)
+
+struct seq_file;
+
+/*
+ * generate IPI list text
+ */
+extern void show_ipi_list(struct seq_file *, int);
+
+/*
+ * Called from assembly code, this handles an IPI.
+ */
+asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
+
+/*
+ * Called from C code, this handles an IPI.
+ */
+void handle_IPI(int ipinr, struct pt_regs *regs);
+
+/*
+ * Setup the set of possible CPUs (via set_cpu_possible)
+ */
+extern void smp_init_cpus(void);
+
+
+/*
+ * Provide a function to raise an IPI cross call on CPUs in callmap.
+ */
+extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
+
+/*
+ * Called from platform specific assembly code, this is the
+ * secondary CPU entry point.
+ */
+asmlinkage void secondary_start_kernel(void);
+
+
+/*
+ * Initial data for bringing up a secondary CPU.
+ */
+struct secondary_data {
+ union {
+ struct mpu_rgn_info *mpu_rgn_info;
+ u64 pgdir;
+ };
+ unsigned long swapper_pg_dir;
+ void *stack;
+};
+extern struct secondary_data secondary_data;
+extern volatile int pen_release;
+extern void secondary_startup(void);
+extern void secondary_startup_arm(void);
+
+extern int __cpu_disable(void);
+
+extern void __cpu_die(unsigned int cpu);
+
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
+
+extern int register_ipi_completion(struct completion *completion, int cpu);
+
+struct smp_operations {
+#ifdef CONFIG_SMP
+ /*
+ * Setup the set of possible CPUs (via set_cpu_possible)
+ */
+ void (*smp_init_cpus)(void);
+ /*
+ * Initialize cpu_possible map, and enable coherency
+ */
+ void (*smp_prepare_cpus)(unsigned int max_cpus);
+
+ /*
+ * Perform platform specific initialisation of the specified CPU.
+ */
+ void (*smp_secondary_init)(unsigned int cpu);
+ /*
+ * Boot a secondary CPU, and assign it the specified idle task.
+ * This also gives us the initial stack to use for this CPU.
+ */
+ int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
+#ifdef CONFIG_HOTPLUG_CPU
+ int (*cpu_kill)(unsigned int cpu);
+ void (*cpu_die)(unsigned int cpu);
+ bool (*cpu_can_disable)(unsigned int cpu);
+ int (*cpu_disable)(unsigned int cpu);
+#endif
+#endif
+};
+
+struct of_cpu_method {
+ const char *method;
+ const struct smp_operations *ops;
+};
+
+#define CPU_METHOD_OF_DECLARE(name, _method, _ops) \
+ static const struct of_cpu_method __cpu_method_of_table_##name \
+ __used __section(__cpu_method_of_table) \
+ = { .method = _method, .ops = _ops }
+/*
+ * set platform specific SMP operations
+ */
+extern void smp_set_ops(const struct smp_operations *);
+
+#endif /* ifndef __ASM_ARM_SMP_H */