On Wed, Aug 20, 2014 at 11:14:48AM +0800, chenj wrote: > +cflags-$(CONFIG_CPU_LOONGSON3) += -D_MIPS_ARCH_LOONGSON3A The _MIPS_ARCH_* namespace belongs to GCC. While it seems current GCC does not define this symbol _MIPS_ARCH_LOONGSON3A runs into the danger of causing a conflict when GCC eventually will define the symbol. Ralf