linux-kernel - Re: [PATCH] serial/atmel_serial: Fix another fallout of the change to BUILD_BUG

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Date:	Tue, 13 Oct 2009 09:26:44 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH] serial/atmel_serial: Fix another fallout of the change
 to BUILD_BUG_ON

Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:
> Commit 8c87df457cb5 fixed BUILD_BUG_ON with the result that some
> expressions (e.g. "not really constant" ones) result in a build failure.
> 
> Some of these were fixed in 8c87df457cb5, but not serial/atmel_serial.

This patch fixes the same issue:

http://lkml.org/lkml/2009/10/6/305

> -	BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE));
> +	MAYBE_BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE));

What's the difference between BUILD_BUG_ON() and MAYBE_BUILD_BUG_ON()?

Haavard
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