linux-kernel - Re: [BUG: 2.6.26-rc3] ERROR: "____ilog2

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Date:	Sun, 8 Jun 2008 14:41:12 +0200
From:	Mirco Tischler <mt-ml@....de>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [BUG: 2.6.26-rc3] ERROR: "____ilog2_NaN" undefined

Here's an update:
I've contacted the gcc folks. Here is the bugzilla entry:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359
We were able to trace the error down to usb_submit_urb() in
drivers/usb/core/urb.c which calls ilog2() and the gcc falsely assumes its
argument (urb->interval) to be zero. But as I understood they say it's the
kernel's fault because the code depends on correct optimization what seems a
little weird for me as incorrect optimization is a gcc bug IMHO. But I am not
an expert and maybe I've just understood something wrong because I'm not a
native speaker.

Thanks
Mirco

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