Which header file?

Hi, In linux/include/linux/atomic.h, there are two files included asm/atomic.h and asm/barrier.h. Both files are present in linux/include/asm-generic and linux/arch/arm/include/asm. If I build like, CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm make zImage dtbs then which file is being used. A kernel newbie, Amit Kumar