livepatch/x86: Rename old_code to old_insns

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60L10
CVE: NA

--------------------------------

In arm/arm64/ppc32/ppc64, this field is named as old_insns, so uniform it.
Signed-off-by: NZheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: NKuohai Xu <xukuohai@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/x86/include/asm/livepatch.h

@@ -36,7 +36,7 @@ int klp_check_calltrace(struct klp_patch *patch, int enable);
 
 #define JMP_E9_INSN_SIZE 5
 struct arch_klp_data {
-	unsigned char old_code[JMP_E9_INSN_SIZE];
+	unsigned char old_insns[JMP_E9_INSN_SIZE];
 #ifdef CONFIG_LIVEPATCH_STOP_MACHINE_CONSISTENCY
 	/*
 	 * Saved opcode at the entry of the old func (which maybe replaced

arch/x86/kernel/livepatch.c

@@ -483,7 +483,7 @@ long arch_klp_save_old_code(struct arch_klp_data *arch_data, void *old_func)
 
 	/* Prevent text modification */
 	mutex_lock(&text_mutex);
-	ret = copy_from_kernel_nofault(arch_data->old_code,
+	ret = copy_from_kernel_nofault(arch_data->old_insns,
 			old_func, JMP_E9_INSN_SIZE);
 	mutex_unlock(&text_mutex);
 
@@ -525,7 +525,7 @@ void arch_klp_unpatch_func(struct klp_func *func)
 	ip = (unsigned long)func_node->old_func;
 	list_del_rcu(&func->stack_node);
 	if (list_empty(&func_node->func_stack)) {
-		new = func_node->arch_data.old_code;
+		new = func_node->arch_data.old_insns;
 	} else {
 		next_func = list_first_or_null_rcu(&func_node->func_stack,
 						struct klp_func, stack_node);