linux-kernel - Re: [PATCH -next v2] arm64: mm: Fix unused variable warning in zone_sizes

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Date:   Wed, 16 Oct 2019 10:54:31 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v2] arm64: mm: Fix unused variable warning in
 zone_sizes_init

On Tue, 2019-10-15 at 20:11 -0700, Nathan Chancellor wrote:
> When building arm64 allnoconfig, CONFIG_ZONE_DMA and CONFIG_ZONE_DMA32
> get disabled so there is a warning about max_dma being unused.
> 
> ../arch/arm64/mm/init.c:215:16: warning: unused variable 'max_dma'
> [-Wunused-variable]
>         unsigned long max_dma = min;
>                       ^
> 1 warning generated.
> 
> Add an ifdef around the variable to fix this.
> 
> Fixes: 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
> 
> v1 -> v2:
> 
> * Fix check for CONFIG_ZONE_DMA32 as pointed out by Will.
> 
>  arch/arm64/mm/init.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 44f07fdf7a59..359c3b08b968 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -212,7 +212,9 @@ static void __init zone_sizes_init(unsigned long min,
> unsigned long max)
>  	struct memblock_region *reg;
>  	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
>  	unsigned long max_dma32 = min;
> +#if defined(CONFIG_ZONE_DMA) || defined(CONFIG_ZONE_DMA32)
>  	unsigned long max_dma = min;
> +#endif
>  
>  	memset(zone_size, 0, sizeof(zone_size));
>  

Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

Thanks!


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