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From: Mirco Tischler <mt-ml@gmx.de>
To: Adrian Bunk <bunk@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>, Greg Kroah-Hartman <gregkh@suse.de>
Subject: Re: [BUG: 2.6.26-rc3] ERROR: "____ilog2_NaN" undefined
Date: Sun, 8 Jun 2008 14:41:12 +0200	[thread overview]
Message-ID: <20080608144112.1d623ed4@mtlp.tischlernetz> (raw)
In-Reply-To: <20080527235619.GI11310@cs181133002.pp.htv.fi>

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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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  reply	other threads:[~2008-06-08 12:41 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-25 17:13 Mirco Tischler
2008-05-25 18:11 ` Adrian Bunk
2008-05-25 19:03   ` Mirco Tischler
2008-05-25 20:18     ` Adrian Bunk
2008-05-25 20:57       ` Mirco Tischler
2008-05-25 21:03         ` Adrian Bunk
2008-05-25 21:49           ` Mirco Tischler
2008-05-26 21:16             ` Mirco Tischler
2008-05-27 23:56               ` Adrian Bunk
2008-06-08 12:41                 ` Mirco Tischler [this message]
2008-06-09 22:14                   ` Greg KH
2008-06-10 10:15                     ` Adrian Bunk

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