linux-kernel - Re: 2.6.32-rc3: floating-point build failure (undefined reference to `_

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Message-ID: <4ACCD3A6.9000306@linux.intel.com>
Date:	Wed, 07 Oct 2009 10:45:10 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Andreas Mohr <andi@...as.de>
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: 2.6.32-rc3: floating-point build failure (undefined reference
 to `__udivdi3' in menu governor)

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...

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