RADIX_TREE_INDEX_BITS   63 lib/radix-tree.c #define RADIX_TREE_MAX_PATH (DIV_ROUND_UP(RADIX_TREE_INDEX_BITS, \
RADIX_TREE_INDEX_BITS 1194 lib/radix-tree.c 	int shift = RADIX_TREE_INDEX_BITS - width;