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 <natechancel...@gmail.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)); -- 2.23.0