CONFIG_S3C2440_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_S3C2440_DMA.
Result is shown for kernelversion 6.5.1

CONFIG_S3C2440_DMA (not configurable)

modulename: dma-s3c2440.ko

configname: CONFIG_S3C2440_DMA

Linux Kernel Configuration
└─>SAMSUNG S3C24XX SoCs Support
└─>S3C2440_DMA
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
Support for S3C2440 specific DMA code5A

source code: