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/Linux-v5.4/block/
Dblk-iocost.c985 u32 active_sum = READ_ONCE(parent->child_active_sum); in current_hweight() local
991 if (!active_sum || !inuse_sum) in current_hweight()
994 active_sum = max(active, active_sum); in current_hweight()
995 hwa = hwa * active / active_sum; /* max 16bits * 10000 */ in current_hweight()