On Thu, Jan 16, 2020 at 11:57 AM Thomas Gleixner [off-list ref] wrote:

Andy Lutomirski [off-list ref] writes:

quoted

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:

That's what I meant to type...

     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

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