On Tue, Mar 01, 2016 at 08:48:10AM +0800, Binbin Zhou wrote: > diff --git a/arch/mips/loongson32/Kconfig b/arch/mips/loongson32/Kconfig > index 7704f20..741867c 100644 > --- a/arch/mips/loongson32/Kconfig > +++ b/arch/mips/loongson32/Kconfig > @@ -1,8 +1,28 @@ > if MACH_LOONGSON32 > > +config ZONE_DMA > + prompt "Zone DMA" > + bool > + There is already a ZONE_DMA option in arch/mips/Kconfig. Do you really need ZONE_DMA? Even if so I suggest to not present this option to the user interactively but enable it with a select - normal users building a kernel will probably not know what ZONE_DMA is. Ralf