Re: [PATCH v5 3/3] asm-generic/io.h: warn in inb() and friends with undefined PCI_IOBASE

[Niklas Schnelle]

On Mon, 2021-05-10 at 15:43 +0200, Arnd Bergmann wrote:
> On Mon, May 10, 2021 at 3:30 PM kernel test robot <lkp@xxxxxxxxx> wrote:
> > All warnings (new ones prefixed by >>):
> > 
> >    In file included from include/linux/kernel.h:10,
> >                     from include/linux/list.h:9,
> >                     from include/linux/module.h:12,
> >                     from drivers/net/arcnet/com20020.c:31:
> >    drivers/net/arcnet/com20020.c: In function 'com20020_reset':
> > > > include/linux/compiler.h:70:32: warning: 'inbyte' is used uninitialized in this function [-Wuninitialized]
> >       70 |   (__if_trace.miss_hit[1]++,1) :  \
> >          |                                ^
> >    drivers/net/arcnet/com20020.c:286:9: note: 'inbyte' was declared here
> >      286 |  u_char inbyte;
> >          |         ^~~~~~
> 
> This looks like a real problem with the patch: the insb()/insw()/insl() helpers
> should memset(buffer, 0xff, size) to avoid using random stack data.
> 
>         Arnd


Yes I agree, will send a v6 shortly. Thanks.