diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h
index fcdd59d77f42..2980bc9b7653 100644
--- a/arch/arc/include/asm/entry.h
+++ b/arch/arc/include/asm/entry.h
@@ -13,6 +13,8 @@
 #include <asm/processor.h>	/* For VMALLOC_START */
 #include <asm/mmu.h>
 
+#ifdef __ASSEMBLY__
+
 #ifdef CONFIG_ISA_ARCOMPACT
 #include <asm/entry-compact.h>	/* ISA specific bits */
 #else
@@ -295,4 +297,23 @@
 
 #endif	/* CONFIG_ARC_CURR_IN_REG */
 
+#else	/* !__ASSEMBLY__ */
+
+extern void do_signal(struct pt_regs *);
+extern void do_notify_resume(struct pt_regs *);
+extern int do_privilege_fault(unsigned long, struct pt_regs *);
+extern int do_extension_fault(unsigned long, struct pt_regs *);
+extern int insterror_is_error(unsigned long, struct pt_regs *);
+extern int do_memory_error(unsigned long, struct pt_regs *);
+extern int trap_is_brkpt(unsigned long, struct pt_regs *);
+extern int do_misaligned_error(unsigned long, struct pt_regs *);
+extern int do_trap5_error(unsigned long, struct pt_regs *);
+extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *);
+extern void do_machine_check_fault(unsigned long, struct pt_regs *);
+extern void do_non_swi_trap(unsigned long, struct pt_regs *);
+extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *);
+extern void do_page_fault(unsigned long, struct pt_regs *);
+
+#endif
+
 #endif  /* __ASM_ARC_ENTRY_H */
diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h
index 0309cb405cfb..c574712ad865 100644
--- a/arch/arc/include/asm/irq.h
+++ b/arch/arc/include/asm/irq.h
@@ -25,5 +25,6 @@
 #include <asm-generic/irq.h>
 
 extern void arc_init_IRQ(void);
+extern void arch_do_IRQ(unsigned int, struct pt_regs *);
 
 #endif
diff --git a/arch/arc/include/asm/mmu.h b/arch/arc/include/asm/mmu.h
index ca427c30f70e..9febf5bc3de6 100644
--- a/arch/arc/include/asm/mmu.h
+++ b/arch/arc/include/asm/mmu.h
@@ -14,6 +14,8 @@ typedef struct {
 	unsigned long asid[NR_CPUS];	/* 8 bit MMU PID + Generation cycle */
 } mm_context_t;
 
+extern void do_tlb_overlap_fault(unsigned long, unsigned long, struct pt_regs *);
+
 #endif
 
 #include <asm/mmu-arcv2.h>
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 5869a74c0db2..cf90fcd2a628 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -181,6 +181,9 @@ static inline unsigned long regs_get_register(struct pt_regs *regs,
 	return *(unsigned long *)((unsigned long)regs + offset);
 }
 
+extern int syscall_trace_entry(struct pt_regs *);
+extern void syscall_trace_exit(struct pt_regs *);
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PTRACE_H */
diff --git a/arch/arc/include/asm/setup.h b/arch/arc/include/asm/setup.h
index 028a8cf76206..374138832c5a 100644
--- a/arch/arc/include/asm/setup.h
+++ b/arch/arc/include/asm/setup.h
@@ -42,4 +42,6 @@ extern void arc_cache_init(void);
 extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
 extern void read_decode_cache_bcr(void);
 
+extern void __init handle_uboot_args(void);
+
 #endif /* __ASMARC_SETUP_H */
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h
index d856491606ac..e0913f52c2cd 100644
--- a/arch/arc/include/asm/smp.h
+++ b/arch/arc/include/asm/smp.h
@@ -29,6 +29,8 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 extern void __init smp_init_cpus(void);
 extern void first_lines_of_secondary(void);
 extern const char *arc_platform_smp_cpuinfo(void);
+extern void arc_platform_smp_wait_to_boot(int);
+extern void start_kernel_secondary(void);
 
 /*
  * API expected BY platform smp code (FROM arch smp code)
diff --git a/arch/arc/kernel/ctx_sw.c b/arch/arc/kernel/ctx_sw.c
index 1a76f2d6f694..bf16f777a0bc 100644
--- a/arch/arc/kernel/ctx_sw.c
+++ b/arch/arc/kernel/ctx_sw.c
@@ -12,7 +12,7 @@
  */
 
 #include <asm/asm-offsets.h>
-#include <linux/sched.h>
+#include <asm/switch_to.h>
 #include <linux/sched/debug.h>
 
 #define KSP_WORD_OFF 	((TASK_THREAD + THREAD_KSP) / 4)
diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c
index 721d465f1580..4c9e61457b2f 100644
--- a/arch/arc/kernel/devtree.c
+++ b/arch/arc/kernel/devtree.c
@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <asm/mach_desc.h>
+#include <asm/serial.h>
 
 #ifdef CONFIG_SERIAL_EARLYCON
 
diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c
index 5cda19d0aa91..678898757e47 100644
--- a/arch/arc/kernel/intc-arcv2.c
+++ b/arch/arc/kernel/intc-arcv2.c
@@ -108,7 +108,7 @@ static void arcv2_irq_unmask(struct irq_data *data)
 	write_aux_reg(AUX_IRQ_ENABLE, 1);
 }
 
-void arcv2_irq_enable(struct irq_data *data)
+static void arcv2_irq_enable(struct irq_data *data)
 {
 	/* set default priority */
 	write_aux_reg(AUX_IRQ_SELECT, data->hwirq);
diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 3c1590c27fae..0b3bb529d246 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -53,6 +53,7 @@
 #include <linux/sched/task_stack.h>
 
 #include <asm/ucontext.h>
+#include <asm/entry.h>
 
 struct rt_sigframe {
 	struct siginfo info;
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index 409cfa4675b4..8d9b188caa27 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -23,9 +23,10 @@
 #include <linux/export.h>
 #include <linux/of_fdt.h>
 
-#include <asm/processor.h>
-#include <asm/setup.h>
 #include <asm/mach_desc.h>
+#include <asm/setup.h>
+#include <asm/smp.h>
+#include <asm/processor.h>
 
 #ifndef CONFIG_ARC_HAS_LLSC
 arch_spinlock_t smp_atomic_ops_lock = __ARCH_SPIN_LOCK_UNLOCKED;
@@ -351,7 +352,7 @@ static inline int __do_IPI(unsigned long msg)
  * arch-common ISR to handle for inter-processor interrupts
  * Has hooks for platform specific IPI
  */
-irqreturn_t do_IPI(int irq, void *dev_id)
+static irqreturn_t do_IPI(int irq, void *dev_id)
 {
 	unsigned long pending;
 	unsigned long __maybe_unused copy;
diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
index 5372dc04e784..ea99c066ef25 100644
--- a/arch/arc/kernel/stacktrace.c
+++ b/arch/arc/kernel/stacktrace.c
@@ -29,6 +29,7 @@
 
 #include <asm/arcregs.h>
 #include <asm/unwind.h>
+#include <asm/stacktrace.h>
 #include <asm/switch_to.h>
 
 /*-------------------------------------------------------------------------
diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 6b83e3f2b41c..2f7eb786695b 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -16,6 +16,7 @@
 #include <linux/ptrace.h>
 #include <linux/kprobes.h>
 #include <linux/kgdb.h>
+#include <asm/entry.h>
 #include <asm/setup.h>
 #include <asm/unaligned.h>
 #include <asm/kprobes.h>
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index 892f6ef29ff4..e78c3070b517 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -580,7 +580,7 @@ static void __ic_line_inv_vaddr(phys_addr_t paddr, unsigned long vaddr,
 
 #endif /* CONFIG_ARC_HAS_ICACHE */
 
-noinline void slc_op_rgn(phys_addr_t paddr, unsigned long sz, const int op)
+static noinline void slc_op_rgn(phys_addr_t paddr, unsigned long sz, const int op)
 {
 #ifdef CONFIG_ISA_ARCV2
 	/*
@@ -643,7 +643,7 @@ noinline void slc_op_rgn(phys_addr_t paddr, unsigned long sz, const int op)
 #endif
 }
 
-noinline void slc_op_line(phys_addr_t paddr, unsigned long sz, const int op)
+static __maybe_unused noinline void slc_op_line(phys_addr_t paddr, unsigned long sz, const int op)
 {
 #ifdef CONFIG_ISA_ARCV2
 	/*
@@ -966,7 +966,7 @@ SYSCALL_DEFINE3(cacheflush, uint32_t, start, uint32_t, sz, uint32_t, flags)
  * 3. All Caches need to be disabled when setting up IOC to elide any in-flight
  *    Coherency transactions
  */
-noinline void __init arc_ioc_setup(void)
+static noinline void __init arc_ioc_setup(void)
 {
 	unsigned int ioc_base, mem_sz;
 
@@ -1028,7 +1028,7 @@ noinline void __init arc_ioc_setup(void)
  *    one core suffices for all
  *  - IOC setup / dma callbacks only need to be done once
  */
-void __init arc_cache_init_master(void)
+static noinline void __init arc_cache_init_master(void)
 {
 	unsigned int __maybe_unused cpu = smp_processor_id();
 
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index f59e722d147f..26e5823c5710 100644
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -13,6 +13,7 @@
 #include <linux/kdebug.h>
 #include <linux/perf_event.h>
 #include <linux/mm_types.h>
+#include <asm/entry.h>
 #include <asm/mmu.h>
 
 /*
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 9f64d729c9f8..6a71b23f1383 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -15,6 +15,7 @@
 #include <linux/highmem.h>
 #include <asm/page.h>
 #include <asm/sections.h>
+#include <asm/setup.h>
 #include <asm/arcregs.h>
 
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index 0ebc737d0ac6..b53ad03ae564 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -389,7 +389,7 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 /*
  * Routine to create a TLB entry
  */
-void create_tlb(struct vm_area_struct *vma, unsigned long vaddr, pte_t *ptep)
+static void create_tlb(struct vm_area_struct *vma, unsigned long vaddr, pte_t *ptep)
 {
 	unsigned long flags;
 	unsigned int asid_or_sasid, rwx;
