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void __init mem_init(void)
{
   unsigned int codepages, datapages, initpages;
   int i, node;
  codepages = &_etext - &_text;//Äں˴úÂë¶ÎµÄ´óС¡£
  datapages = &_end - &__data_start;//ÄÚºËÊý¾Ý¶ÎµÄ´óС¡£
  initpages = &__init_end - &__init_begin;//Äں˳õʼ»¯Ïà¹Øº¯ÊýÖ¸Õë¿Õ¼ä¶ÎµÄ´óС¡£
 #ifndef CONFIG_DISCONTIGMEM//Èç¹ûϵͳÄÚ´æ¿Õ¼äÁ¬ÐøµÄ»°¡£
        max_mapnr   = virt_to_page(high_memory) - mem_map;//max_mapnr±£´æ×Å×î´óµÍ¶ËÄÚ´æÒ³Êý¡£
 #endif
 if (meminfo.nr_banks != 1)//Èç¹ûbank²»Ö¹Ò»¸ö£¬ËµÃ÷¿ÉÄÜ´æÔÚÄÚ´æ¿×¶´¡£
       create_memmap_holes(&meminfo);//¶Ôÿ¸önodeµÄbank½øÐмì²é£¬Ö»Òª·¢ÏÖǰºóÊôÓÚÕâ¸önodeµÄÏàÁÚbankµÄÊÕβҳºÅ²»Ò»
                                                               //ÑùµÄʱºò£¬ÎÒÃǾ͵÷ÓÃfree_memmap(),Õâ¸öº¯ÊýÊ×ÏÈͨ¹ýÒ³ºÅת»»³ÉÕâÁ½¸öÒ³¶ÔÓ¦µÄ
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