Re: [PATCH 10/10] virtio: enable endian checks for sparse builds

Michael S. Tsirkin
2016-12-07T13:22:31Z

On Wed, Dec 07, 2016 at 07:25:51AM +0100, Johannes Berg wrote:
> On Tue, 2016-12-06 at 17:41 +0200, Michael S. Tsirkin wrote:
>
> > It seems that there should be a better way to do it,
> > but this works too.
>
> In some cases there might be:
>
> > --- a/drivers/s390/virtio/Makefile
> > +++ b/drivers/s390/virtio/Makefile
> > @@ -6,6 +6,8 @@
> >  # it under the terms of the GNU General Public License (version 2
> > only)
> >  # as published by the Free Software Foundation.
> >
> > +CFLAGS_virtio_ccw.o += -D__CHECK_ENDIAN__
> > +CFLAGS_kvm_virtio.o += -D__CHECK_ENDIAN__
> >  s390-virtio-objs := virtio_ccw.o
> >  ifdef CONFIG_S390_GUEST_OLD_TRANSPORT
> >  s390-virtio-objs += kvm_virtio.o
>
> Here you could use
>
> ccflags-y += -D__CHECK_ENDIAN__
>
> for example, or even
>
> subdir-ccflags-y += -D__CHECK_ENDIAN__
>
> (in case any subdirs ever get added here)

Oh right. I forgot this directory only has virtio stuff.

> > --- a/drivers/vhost/Makefile
> > +++ b/drivers/vhost/Makefile
> > @@ -1,3 +1,4 @@
> > +ccflags-y := -D__CHECK_ENDIAN__
>
> Looks like you did that here and in some other places though - so
> perhaps the s390 one was intentionally different?
>
> > --- a/net/packet/Makefile
> > +++ b/net/packet/Makefile
> > @@ -2,6 +2,7 @@
> >  # Makefile for the packet AF.
> >  #
> >
> > +ccflags-y := -D__CHECK_ENDIAN__
>
> Technically this is slightly more than advertised, but I guess that
> still makes sense if it's clean now.
>
> johannes