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Message-Id: <201212181603.42094.jbe@pengutronix.de>
Date: Tue, 18 Dec 2012 16:03:41 +0100
From: Juergen Beisert <jbe@...gutronix.de>
To: linux-kernel@...r.kernel.org
Subject: Strange results of DIV_ROUND_CLOSEST
Hi list,
commit 263a523d18bca306016d75f5c8d5c57c37fe52fb changes the code of
DIV_ROUND_CLOSEST in include/linux/kernel.h to fix a compile time warning.
But now feeding in a zero into this macro results into 4198403. Tested with
gcc 4.4.3 and 4.7.2, on arch x86 and ARM.
I can reproduce this behaviour, when my ADC delivers a '0' value in the driver
drivers/hwmon/s3c-hwmon.c in function s3c_hwmon_ch_show() with a current
3.7.1 kernel. The value is correct again, when the ADC delivers at least
a '1'.
Any ideas how to fix it correctly?
jbe
--
Pengutronix e.K. | Juergen Beisert |
Linux Solutions for Science and Industry | http://www.pengutronix.de/ |
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