2017-12-18 19:26 GMT+08:00 Arnd Bergmann <arnd@xxxxxxxx>: > On Mon, Dec 18, 2017 at 7:46 AM, Greentime Hu <green.hu@xxxxxxxxx> wrote: > >> +#define __ASM_NDS32_IO_H >> + >> +extern void iounmap(void __iomem *addr); > > The prototype here should probably include 'volatile' to avoid warnings in an > allmodconfig build. > Thanks. I will update it like this. extern void iounmap(volatile void __iomem *addr);