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void __init mem_init(void)
{
unsigned int codepages, datapages, initpages;
int i, node;
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datapages = &_end - &__data_start;//ÄÚºËÊý¾Ý¶ÎµÄ´óС¡£
initpages = &__init_end - &__init_begin;//Äں˳õʼ»¯Ïà¹Øº¯ÊýÖ¸Õë¿Õ¼ä¶ÎµÄ´óС¡£
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max_mapnr = virt_to_page(high_memory) - mem_map;//max_mapnr±£´æ×Å×î´óµÍ¶ËÄÚ´æÒ³Êý¡£
#endif
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