linux-kernel - Re: [PATCH] atmel_serial: Fix bad BUILD_BUG

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Date:	Wed, 07 Oct 2009 15:16:36 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
CC:	Andrew Victor <avictor.za@...il.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] atmel_serial: Fix bad BUILD_BUG_ON() usage

Haavard Skinnemoen :
> is_power_of_2() appears not to be constant enough for BUILD_BUG_ON()
> after the latest rework, so replace it with an open-coded test.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---
>  drivers/serial/atmel_serial.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
> index 3551c5c..9d948bc 100644
> --- a/drivers/serial/atmel_serial.c
> +++ b/drivers/serial/atmel_serial.c
> @@ -1531,7 +1531,7 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
>  	void *data;
>  	int ret;
>  
> -	BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE));
> +	BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
>  
>  	port = &atmel_ports[pdev->id];
>  	port->backup_imr = 0;


-- 
Nicolas Ferre

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