linux-kernel - Re: [PATCH] arm64: mm: use macro instead of if judgement of ZONE

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Date:	Fri, 17 Oct 2014 12:51:56 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Yifan Zhang <yifan.zhangm@...il.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, mark.rutland@....com,
	lauraa@...eaurora.org, ganapatrao.kulkarni@...iumnetworks.com,
	robh@...nel.org, leif.lindholm@...aro.org,
	Yalin.Wang@...ymobile.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org, Yifan Zhang <zhangyf@...vell.com>
Subject: Re: [PATCH] arm64: mm: use macro instead of if judgement of ZONE_DMA

Hello,

On Thu, Oct 16, 2014 at 05:19:43PM +0800, Yifan Zhang wrote:
> @@ -82,10 +82,10 @@ static void __init zone_sizes_init(unsigned long
> min, unsigned long max)
> 
>         memset(zone_size, 0, sizeof(zone_size));
> 
> 
> 
>         /* 4GB maximum for 32-bit only capable devices */
> 
> -        if (IS_ENABLED(CONFIG_ZONE_DMA)) {
> 
> -                 max_dma = PFN_DOWN(max_zone_dma_phys());
> 
> -                 zone_size[ZONE_DMA] = max_dma - min;
> 
> -        }
> 
> +#ifdef CONFIG_ZONE_DMA
> 
> +       max_dma = PFN_DOWN(max_zone_dma_phys());
> 
> +       zone_size[ZONE_DMA] = max_dma - min;
> 
> +#endif
Apart from your patch being broken (probably by your MUA or MTA) usually
if (IS_ENABLED(...)) is preferred over #ifdef because it doesn't stand
out over the other program source.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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