Function _memblock_add_range

components/mm/mm_memblock.c:120–160

adding overlapped regions is banned */

/* adding overlapped regions is banned */
static rt_err_t _memblock_add_range(struct rt_memblock *memblock,
                    const char *name, rt_size_t start, rt_size_t end, mm_flag_t flag)
{
    struct rt_mmblk_reg *reg = RT_NULL, *reg_next = RT_NULL;
    rt_slist_t sentinel;
    rt_region_t new_region;

    if (start >= end)
        return -RT_EINVAL;

    sentinel.next = &(memblock->reg_list);

    /* find suitable place */
    rt_slist_for_each_entry(reg, &sentinel, node)
    {
        reg_next = _next_region(reg);

        if (reg_next == RT_NULL)
            break;

        rt_size_t rstart = reg_next->memreg.start;
        rt_size_t rend = reg_next->memreg.end;

        /* not overlap */
        if (rstart >= end)
            break;
        if (rend <= start)
            continue;

        /* overlap */
        LOG_E("region to add %s: [%p-%p) overlap with existing region %s: [%p-%p)",\
                name, start, end, reg_next->memreg.name, rstart, rend);
        return -RT_EINVAL;
    }

    /* insert the region */
    new_region.name = name;
    new_region.start = start;
    new_region.end = end;
    return _reg_insert_after(reg, &new_region, flag);
}

rt_err_t rt_memblock_add_memory(const char *name, rt_size_t start, rt_size_t end, mmblk_flag_t flags)
{