WB_FRN_HIST_THR_SLOTS 242 fs/fs-writeback.c #define WB_FRN_HIST_MAX_SLOTS (WB_FRN_HIST_THR_SLOTS / 2 + 1) WB_FRN_HIST_THR_SLOTS 696 fs/fs-writeback.c if (hweight32(history) > WB_FRN_HIST_THR_SLOTS)