linux-kernel - Re: [PATCH -next v3] arm64: mm: Fix unused variable warning in zone_sizes

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Message-ID: <20191016150846.GO49619@arrakis.emea.arm.com>
Date:   Wed, 16 Oct 2019 16:08:47 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Will Deacon <will@...nel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v3] arm64: mm: Fix unused variable warning in
 zone_sizes_init

On Wed, Oct 16, 2019 at 07:47:14AM -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 __maybe_unused to make this clear to the compiler.
> 
> Fixes: 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Thanks. Queued on top of Nicolas' patches for 5.5. I also added Nicolas'
reviewed-by from v2 as I suspect it still stands.

-- 
Catalin