los_rootfs.c:567:45: error: use of undeclared identifier 'STORAGE_SIZE'

**【模块名_概率】简要描述：**

**【环境信息】:** 
- 网络环境
- 硬件开发板型号
- 软件版本信息或tag节点
- 测试环境
- 其他

**【预置条件】:**

**【测试步骤】：**
按https://gitee.com/openharmony/device_qemu/tree/master/arm_virt readme文档中的步骤，编译qemu工程。报错信息见下文。

**【预期结果】：**

**【实际结果】：**

**【恢复手段】：**

**【出现概率】：问题出现次数/实际测试次数**

**【定位信息】：**

- 下面567行使用到的STORAGE_SIZE宏定义在其他宏的内部，使用的时候 没有满足条件的宏导致报错？
![输入图片说明](https://images.gitee.com/uploads/images/2021/0625/195255_3de538ee_5416512.png "屏幕截图.png")

- STORAGE_SIZE的定义

![输入图片说明](https://images.gitee.com/uploads/images/2021/0625/195437_db7838c5_5416512.png "屏幕截图.png")

- 1. Log、截图、多媒体文件等，所有和问题有关的信息：

```
[OHOS ERROR] make[1]: Entering directory '/home/zhushy/openharmony2/kernel/liteos_a/kernel/common'
[OHOS ERROR] los_rootfs.c:567:45: error: use of undeclared identifier 'STORAGE_SIZE'
[OHOS ERROR]     userSize = (userSize >= 0) ? userSize : STORAGE_SIZE;
[OHOS ERROR]                                             ^
[OHOS ERROR] 1 error generated.
[OHOS ERROR] make[1]: *** [/home/zhushy/openharmony2/kernel/liteos_a/tools/build/mk/module.mk:71: /home/zhushy/openharmony2/device/qemu/arm_virt/build/out/qemu_arm_virt_ca7/obj/kernel/liteos_a//obj/kernel/rootfs/los_rootfs.o] Error 1
[OHOS ERROR] make[1]: Leaving directory '/home/zhushy/openharmony2/kernel/liteos_a/kernel/common'
[OHOS ERROR] make: *** [Makefile:153: liteos] Error 1
[OHOS ERROR] you can check build log in /home/zhushy/openharmony2/out/arm_virt/build.log
[OHOS ERROR] command: "/home/zhushy/ninja/ninja -w dupbuild=warn -C /home/zhushy/openharmony2/out/arm_virt" failed
[OHOS ERROR] return code: 1
[OHOS ERROR] execution path: /home/zhushy/openharmony2/device/qemu/arm_virt

```

![输入图片说明](https://images.gitee.com/uploads/images/2021/0625/195025_6e463663_5416512.png "屏幕截图.png")

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