Andy Lutomirski <l...@kernel.org> writes: > On Thu, Jan 16, 2020 at 9:58 AM Christophe Leroy > > Would mul_u64_u64_shr() be a good alternative? Could we adjust it to > assume the shift is less than 32? That function exists to benefit > 32-bit arches.
We'd want mul_u64_u32_shr() for this. The rules for mult and shift are: 1 <= mult <= U32_MAX 1 <= shift <= 32 If we want to enforce a shift < 32 we need to limit that conditionally in the calculation/registration function. Thanks, tglx