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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/nds32/kernel/ftrace.c
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@@ -7,7 +7,6 @@
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 #ifndef CONFIG_DYNAMIC_FTRACE
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 extern void (*ftrace_trace_function)(unsigned long, unsigned long,
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 				     struct ftrace_ops*, struct pt_regs*);
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-extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
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 extern void ftrace_graph_caller(void);
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 noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
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@@ -90,18 +89,6 @@
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 	return 0;
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 }
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-int ftrace_arch_code_modify_prepare(void)
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-{
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-	set_all_modules_text_rw();
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-	return 0;
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-}
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-
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-int ftrace_arch_code_modify_post_process(void)
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-{
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-	set_all_modules_text_ro();
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-	return 0;
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-}
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-
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 static unsigned long gen_sethi_insn(unsigned long addr)
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 {
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 	unsigned long opcode = 0x46000000;
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@@ -144,13 +131,14 @@
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 	unsigned long orig_insn[3];
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 	if (validate) {
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-		if (probe_kernel_read(orig_insn, (void *)pc, MCOUNT_INSN_SIZE))
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+		if (copy_from_kernel_nofault(orig_insn, (void *)pc,
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+				MCOUNT_INSN_SIZE))
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 			return -EFAULT;
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 		if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
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 			return -EINVAL;
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 	}
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-	if (probe_kernel_write((void *)pc, new_insn, MCOUNT_INSN_SIZE))
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+	if (copy_to_kernel_nofault((void *)pc, new_insn, MCOUNT_INSN_SIZE))
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 		return -EPERM;
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 	return 0;