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arm64: mm: Fix unused variable warning in zone_sizes_init

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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: 1a8e1cef76 ("arm64: use both ZONE_DMA and ZONE_DMA32")
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Nathan Chancellor 2019-10-16 07:47:14 -07:00 committed by Catalin Marinas
parent 734f9246e7
commit 4399d43070
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/mm/init.c
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@ -212,7 +212,7 @@ 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;
unsigned long max_dma = min;
unsigned long __maybe_unused max_dma = min;
memset(zone_size, 0, sizeof(zone_size));