操作系统中存储管理用代码该怎么把两个空闲区间合并

你可以使用以下代码实现将两个空闲区间合并：

//定义空闲区间结构体
struct free_area {
struct list_head free_list;
unsigned long nr_free;
};

//将两个空闲区间合并的函数
static inline void
__free_area_merge(struct free_area *area, struct free_list *p,
struct free_list *c, unsigned long *nr_merged)
{
if (p && p->end_pfn == c->first_pfn) {
p->end_pfn = c->end_pfn;
list_del(&c->list);
*nr_merged = 1;
} else {
*nr_merged = 0;
}
}

//存储管理代码中的主函数
void free_area_init_core(struct pglist_data *pgdat, unsigned long pstart,
unsigned long size, unsigned long *zones_size,
int zones) {

//分配空闲区间结构体
struct free_area *area = pgdat->free_area;

//遍历空闲区间结构体并将相邻的空闲区间合并
struct free_list *prev = NULL;
struct free_list *curr = area->free_list;
while (curr) {
unsigned long nr_merged = 0;
__free_area_merge(area, prev, curr, &nr_merged);
if (nr_merged) {
curr = prev ? prev->next : area->free_list;
} else {
prev = curr;
curr = curr->next;
}
}
}

希望能够解决您的问题，如果您有任何疑问，请随时问我！