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/Linux-v5.4/block/
Dblk-iocost.c986 u32 inuse_sum = READ_ONCE(parent->child_inuse_sum); in current_hweight() local
991 if (!active_sum || !inuse_sum) in current_hweight()
997 inuse_sum = max(inuse, inuse_sum); in current_hweight()
998 hwi = hwi * inuse / inuse_sum; /* max 16bits * 10000 */ in current_hweight()