On 30.11.2022 12:27, Ayan Kumar Halder wrote: > Looking at "min(flsl(mfn + 1) - 1 + PAGE_SHIFT, PADDR_BITS);", I do not > understand the reason for "... -1" (ie subtracting by 1). > > Do you know the reason ?
That's because fls() and flsl() and friends return 1-based bit indexes (with 0 being returned when the input was zero), when we need 0-based values here. Jan
