Question about mm/compaction.c/acct_isolated: computing nr_anon, nr_file

Why does it double the number in line 233/234?

222/* Update the number of anon and file isolated pages in the zone */ 223static void acct_isolated(struct zone *zone, struct compact_control *cc) 224{
225 struct page *page;
226 unsigned int count[NR_LRU_LISTS] = { 0, };
227
228 list_for_each_entry(page, &cc->migratepages, lru) {
229 int lru = page_lru_base_type(page);
230 count[lru]++;
231 }
232

 233        cc->nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
 234        cc->nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
 235        __mod_zone_page_state(zone, NR_ISOLATED_ANON, cc->nr_anon);
 236        __mod_zone_page_state(zone, NR_ISOLATED_FILE, cc->nr_file);

237}

thanks,

Sorry, I mistook looking the code. Please ignore the mail.

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