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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: 1a8e1ce ("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>
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Nathan Chancellor authored and Catalin Marinas committed Oct 16, 2019
1 parent 734f924 commit 4399d43
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion arch/arm64/mm/init.c
Original file line number Diff line number Diff line change
@@ -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));

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