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

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Date:	Fri, 9 Oct 2009 18:01:23 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Kyle McMartin <kyle@...artin.ca>
Cc:	Andreas Mohr <andi@...as.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	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)

Hi,

On Wed, Oct 07, 2009 at 01:45:54PM -0400, Kyle McMartin wrote:
> On Wed, Oct 07, 2009 at 07:34:58PM +0200, Andreas Mohr wrote:
> > Still happening.
> > IOW it must be somewhere inside the DIV_ROUND_CLOSEST macro or so.
> > 
> 
> It's being a jerk and not realizing that RESOLUTION * DECAY is a power
> of 2, so it can just do a shift...
> 
> I don't recall if gcc 3 had these magic builtins, but if it does,
> something like this might help since it's the u64 case that's
> problematic.

Uh... nope:

In file included from kernel/sched.c:1818:
kernel/sched_fair.c: In function `select_task_rq_fair':
kernel/sched_fair.c:1366: implicit declaration of function `__builtin_popcountll'
kernel/sched_fair.c:1366: implicit declaration of function `__builtin_ffsll'
kernel/sched_fair.c:1366: warning: suggest parentheses around + or - inside shift
kernel/sched.c: In function `update_sg_lb_stats':
kernel/sched.c:3755: warning: suggest parentheses around + or - inside shift
kernel/sched.c: In function `find_busiest_queue':
kernel/sched.c:4050: warning: suggest parentheses around + or - inside shift
make[1]: *** [kernel/sched.o] Error 1
make: *** [kernel] Error 2


Hmpf. Rather stuck now, ain'tcha, given that gcc 3.2.3 doesn't even have those?

Thanks,

Andreas Mohr
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