__swap_duplicate 3447 mm/swapfile.c  	__swap_duplicate(entry, SWAP_MAP_SHMEM);
__swap_duplicate 3461 mm/swapfile.c  	while (!err && __swap_duplicate(entry, 1) == -ENOMEM)
__swap_duplicate 3476 mm/swapfile.c  	return __swap_duplicate(entry, SWAP_HAS_CACHE);