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  /external/kernel-headers/original/linux/
mm.h 227 atomic_t _mapcount; /* Count of ptes mapped in mms, member in struct:page
599 * The atomic page->_mapcount, like _count, starts from -1:
605 atomic_set(&(page)->_mapcount, -1);
610 return atomic_read(&(page)->_mapcount) + 1;
618 return atomic_read(&(page)->_mapcount) >= 0;
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