[small mem]介绍过时了,现在的内存信息存储的和以前不一样

### [small mem]介绍过时了,现在的内存信息存储的和以前不一样
- 原介绍
![输入图片说明](https://foruda.gitee.com/images/1713107491059446078/78a5a1bc_8153170.png "屏幕截图")
- 现在实现
```c
struct rt_small_mem_item
{
    rt_ubase_t              pool_ptr;         /**< small memory object addr */
#ifdef ARCH_CPU_64BIT
    rt_uint32_t             resv;
#endif /* ARCH_CPU_64BIT */
    rt_size_t               next;             /**< next free item */
    rt_size_t               prev;             /**< prev free item */
#ifdef RT_USING_MEMTRACE
#ifdef ARCH_CPU_64BIT
    rt_uint8_t              thread[8];       /**< thread name */
#else
    rt_uint8_t              thread[4];       /**< thread name */
#endif /* ARCH_CPU_64BIT */
#endif /* RT_USING_MEMTRACE */
};

#define MEM_MASK             0xfffffffe
#define MEM_USED(_mem)       ((((rt_base_t)(_mem)) & MEM_MASK) | 0x1)
#define MEM_FREED(_mem)      ((((rt_base_t)(_mem)) & MEM_MASK) | 0x0)
#define MEM_ISUSED(_mem)   \
                      (((rt_base_t)(((struct rt_small_mem_item *)(_mem))->pool_ptr)) & (~MEM_MASK))
```

### 解决方法
- 有空我进行修改补充

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