Re: 2.6.32-rc3: floating-point build failure (undefined reference to `__udivdi3' in menu governor)

Arjan van de Ven
2009-10-07T17:46:15Z

Andreas Mohr wrote:
> Hi,
>> looking at it, can you try sticking (u32) at the end of line 212; that multiply is not very likely to exceed 32 bits
>
> Nopeee.
>
> data->predicted_us = DIV_ROUND_CLOSEST((u32)
> data->expected_us * data->correction_factor[data->bucket],
> (u32)RESOLUTION * DECAY);
>
> It did properly rebuild drivers/cpuidle/governors/menu.o.
> Still happening.
> IOW it must be somewhere inside the DIV_ROUND_CLOSEST macro or so.

it looks like your GCC has a problem dividing by a power of two though;
both DECAY and RESOLUTION are powers of two...