[10/10] virtio: enable endian checks for sparse builds
diff mbox

Message ID 1481038106-24899-11-git-send-email-mst@redhat.com
State New
Headers show

Commit Message

Michael S. Tsirkin Dec. 6, 2016, 3:41 p.m. UTC
__CHECK_ENDIAN__ isn't on by default presumably because
it triggers too many sparse warnings for correct code.
But virtio is now clean of these warnings, and
we want to keep it this way - enable this for
sparse builds.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

It seems that there should be a better way to do it,
but this works too.

 drivers/block/Makefile          | 1 +
 drivers/char/Makefile           | 1 +
 drivers/char/hw_random/Makefile | 2 ++
 drivers/gpu/drm/virtio/Makefile | 1 +
 drivers/net/Makefile            | 3 +++
 drivers/net/caif/Makefile       | 1 +
 drivers/rpmsg/Makefile          | 1 +
 drivers/s390/virtio/Makefile    | 2 ++
 drivers/scsi/Makefile           | 1 +
 drivers/vhost/Makefile          | 1 +
 drivers/virtio/Makefile         | 3 +++
 net/9p/Makefile                 | 1 +
 net/packet/Makefile             | 1 +
 net/vmw_vsock/Makefile          | 2 ++
 14 files changed, 21 insertions(+)

Comments

Jason Wang Dec. 7, 2016, 5:27 a.m. UTC | #1
On 2016年12月06日 23:41, Michael S. Tsirkin wrote:
> __CHECK_ENDIAN__ isn't on by default presumably because
> it triggers too many sparse warnings for correct code.
> But virtio is now clean of these warnings, and
> we want to keep it this way - enable this for
> sparse builds.
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>
> It seems that there should be a better way to do it,
> but this works too.

Reviewed-by: Jason Wang <jasowang@redhat.com>

>
>   drivers/block/Makefile          | 1 +
>   drivers/char/Makefile           | 1 +
>   drivers/char/hw_random/Makefile | 2 ++
>   drivers/gpu/drm/virtio/Makefile | 1 +
>   drivers/net/Makefile            | 3 +++
>   drivers/net/caif/Makefile       | 1 +
>   drivers/rpmsg/Makefile          | 1 +
>   drivers/s390/virtio/Makefile    | 2 ++
>   drivers/scsi/Makefile           | 1 +
>   drivers/vhost/Makefile          | 1 +
>   drivers/virtio/Makefile         | 3 +++
>   net/9p/Makefile                 | 1 +
>   net/packet/Makefile             | 1 +
>   net/vmw_vsock/Makefile          | 2 ++
>   14 files changed, 21 insertions(+)
>
> diff --git a/drivers/block/Makefile b/drivers/block/Makefile
> index 1e9661e..597481c 100644
> --- a/drivers/block/Makefile
> +++ b/drivers/block/Makefile
> @@ -27,6 +27,7 @@ obj-$(CONFIG_BLK_DEV_OSD)	+= osdblk.o
>   obj-$(CONFIG_BLK_DEV_UMEM)	+= umem.o
>   obj-$(CONFIG_BLK_DEV_NBD)	+= nbd.o
>   obj-$(CONFIG_BLK_DEV_CRYPTOLOOP) += cryptoloop.o
> +CFLAGS_virtio_blk.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_VIRTIO_BLK)	+= virtio_blk.o
>   
>   obj-$(CONFIG_BLK_DEV_SX8)	+= sx8.o
> diff --git a/drivers/char/Makefile b/drivers/char/Makefile
> index 6e6c244..a99467d 100644
> --- a/drivers/char/Makefile
> +++ b/drivers/char/Makefile
> @@ -6,6 +6,7 @@ obj-y				+= mem.o random.o
>   obj-$(CONFIG_TTY_PRINTK)	+= ttyprintk.o
>   obj-y				+= misc.o
>   obj-$(CONFIG_ATARI_DSP56K)	+= dsp56k.o
> +CFLAGS_virtio_console.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_VIRTIO_CONSOLE)	+= virtio_console.o
>   obj-$(CONFIG_RAW_DRIVER)	+= raw.o
>   obj-$(CONFIG_SGI_SNSC)		+= snsc.o snsc_event.o
> diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
> index 5f52b1e..a2b0931 100644
> --- a/drivers/char/hw_random/Makefile
> +++ b/drivers/char/hw_random/Makefile
> @@ -17,6 +17,8 @@ obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
>   obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
>   obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o
>   obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
> +CFLAGS_virtio_transport.o += -D__CHECK_ENDIAN__
> +CFLAGS_virtio-rng.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
>   obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
>   obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
> diff --git a/drivers/gpu/drm/virtio/Makefile b/drivers/gpu/drm/virtio/Makefile
> index 3fb8eac..1162366 100644
> --- a/drivers/gpu/drm/virtio/Makefile
> +++ b/drivers/gpu/drm/virtio/Makefile
> @@ -3,6 +3,7 @@
>   # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>   
>   ccflags-y := -Iinclude/drm
> +ccflags-y += -D__CHECK_ENDIAN__
>   
>   virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_drm_bus.o virtgpu_gem.o \
>   	virtgpu_fb.o virtgpu_display.o virtgpu_vq.o virtgpu_ttm.o \
> diff --git a/drivers/net/Makefile b/drivers/net/Makefile
> index 7336cbd..3f587de 100644
> --- a/drivers/net/Makefile
> +++ b/drivers/net/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_EQUALIZER) += eql.o
>   obj-$(CONFIG_IFB) += ifb.o
>   obj-$(CONFIG_MACSEC) += macsec.o
>   obj-$(CONFIG_MACVLAN) += macvlan.o
> +CFLAGS_macvtap.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_MACVTAP) += macvtap.o
>   obj-$(CONFIG_MII) += mii.o
>   obj-$(CONFIG_MDIO) += mdio.o
> @@ -20,8 +21,10 @@ obj-$(CONFIG_NETCONSOLE) += netconsole.o
>   obj-$(CONFIG_PHYLIB) += phy/
>   obj-$(CONFIG_RIONET) += rionet.o
>   obj-$(CONFIG_NET_TEAM) += team/
> +CFLAGS_tun.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_TUN) += tun.o
>   obj-$(CONFIG_VETH) += veth.o
> +CFLAGS_virtio_net.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
>   obj-$(CONFIG_VXLAN) += vxlan.o
>   obj-$(CONFIG_GENEVE) += geneve.o
> diff --git a/drivers/net/caif/Makefile b/drivers/net/caif/Makefile
> index 9bbd453..d1a922c 100644
> --- a/drivers/net/caif/Makefile
> +++ b/drivers/net/caif/Makefile
> @@ -12,3 +12,4 @@ obj-$(CONFIG_CAIF_HSI) += caif_hsi.o
>   
>   # Virtio interface
>   obj-$(CONFIG_CAIF_VIRTIO) += caif_virtio.o
> +CFLAGS_caif_virtio.o += -D__CHECK_ENDIAN__
> diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
> index ae9c913..23c8b66 100644
> --- a/drivers/rpmsg/Makefile
> +++ b/drivers/rpmsg/Makefile
> @@ -1,3 +1,4 @@
>   obj-$(CONFIG_RPMSG)		+= rpmsg_core.o
>   obj-$(CONFIG_RPMSG_QCOM_SMD)	+= qcom_smd.o
>   obj-$(CONFIG_RPMSG_VIRTIO)	+= virtio_rpmsg_bus.o
> +CFLAGS_virtio_rpmsg_bus.o	+= -D__CHECK_ENDIAN__
> diff --git a/drivers/s390/virtio/Makefile b/drivers/s390/virtio/Makefile
> index df40692..270ada5 100644
> --- a/drivers/s390/virtio/Makefile
> +++ b/drivers/s390/virtio/Makefile
> @@ -6,6 +6,8 @@
>   # it under the terms of the GNU General Public License (version 2 only)
>   # as published by the Free Software Foundation.
>   
> +CFLAGS_virtio_ccw.o += -D__CHECK_ENDIAN__
> +CFLAGS_kvm_virtio.o += -D__CHECK_ENDIAN__
>   s390-virtio-objs := virtio_ccw.o
>   ifdef CONFIG_S390_GUEST_OLD_TRANSPORT
>   s390-virtio-objs += kvm_virtio.o
> diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
> index 38d938d..9f70d46 100644
> --- a/drivers/scsi/Makefile
> +++ b/drivers/scsi/Makefile
> @@ -135,6 +135,7 @@ obj-$(CONFIG_SCSI_BNX2_ISCSI)	+= libiscsi.o bnx2i/
>   obj-$(CONFIG_BE2ISCSI)		+= libiscsi.o be2iscsi/
>   obj-$(CONFIG_SCSI_ESAS2R)	+= esas2r/
>   obj-$(CONFIG_SCSI_PMCRAID)	+= pmcraid.o
> +CFLAGS_virtio_scsi.o += -D__CHECK_ENDIAN__
>   obj-$(CONFIG_SCSI_VIRTIO)	+= virtio_scsi.o
>   obj-$(CONFIG_VMWARE_PVSCSI)	+= vmw_pvscsi.o
>   obj-$(CONFIG_XEN_SCSI_FRONTEND)	+= xen-scsifront.o
> diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile
> index 6b012b9..619e2cd 100644
> --- a/drivers/vhost/Makefile
> +++ b/drivers/vhost/Makefile
> @@ -1,3 +1,4 @@
> +ccflags-y := -D__CHECK_ENDIAN__
>   obj-$(CONFIG_VHOST_NET) += vhost_net.o
>   vhost_net-y := net.o
>   
> diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
> index 41e30e3..d331f19 100644
> --- a/drivers/virtio/Makefile
> +++ b/drivers/virtio/Makefile
> @@ -1,3 +1,6 @@
> +#virtio must be kept clean wrt endian tags,
> +#otherwise we'll get to maintain broken host/guest ABIs
> +ccflags-y := -D__CHECK_ENDIAN__
>   obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
>   obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
>   obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
> diff --git a/net/9p/Makefile b/net/9p/Makefile
> index a0874cc..acf1225 100644
> --- a/net/9p/Makefile
> +++ b/net/9p/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
>   	trans_fd.o \
>   	trans_common.o \
>   
> +CFLAGS_trans_virtio.o += -D__CHECK_ENDIAN__
>   9pnet_virtio-objs := \
>   	trans_virtio.o \
>   
> diff --git a/net/packet/Makefile b/net/packet/Makefile
> index 9df6134..a13bcb3 100644
> --- a/net/packet/Makefile
> +++ b/net/packet/Makefile
> @@ -2,6 +2,7 @@
>   # Makefile for the packet AF.
>   #
>   
> +ccflags-y := -D__CHECK_ENDIAN__
>   obj-$(CONFIG_PACKET) += af_packet.o
>   obj-$(CONFIG_PACKET_DIAG) += af_packet_diag.o
>   af_packet_diag-y += diag.o
> diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile
> index bc27c70..a61eccb 100644
> --- a/net/vmw_vsock/Makefile
> +++ b/net/vmw_vsock/Makefile
> @@ -8,6 +8,8 @@ vsock-y += af_vsock.o vsock_addr.o
>   vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \
>   	vmci_transport_notify_qstate.o
>   
> +CFLAGS_virtio_transport.o += -D__CHECK_ENDIAN__
> +CFLAGS_virtio_transport_common.o += -D__CHECK_ENDIAN__
>   vmw_vsock_virtio_transport-y += virtio_transport.o
>   
>   vmw_vsock_virtio_transport_common-y += virtio_transport_common.o

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Johannes Berg Dec. 7, 2016, 6:25 a.m. UTC | #2
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)

> --- 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

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Christoph Hellwig Dec. 7, 2016, 7:30 a.m. UTC | #3
On Tue, Dec 06, 2016 at 05:41:05PM +0200, Michael S. Tsirkin wrote:
> __CHECK_ENDIAN__ isn't on by default presumably because
> it triggers too many sparse warnings for correct code.
> But virtio is now clean of these warnings, and
> we want to keep it this way - enable this for
> sparse builds.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Nah.  Please just enable it globally when using sparse.  I actually
had a chat with Linus about that a while ago and he seemed generally
fine with it, I just didn't manage to actually do it..
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Michael S. Tsirkin Dec. 7, 2016, 1:22 p.m. UTC | #4
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
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Stefan Hajnoczi Dec. 7, 2016, 2:09 p.m. UTC | #5
On Tue, Dec 06, 2016 at 05:41:05PM +0200, Michael S. Tsirkin wrote:
> __CHECK_ENDIAN__ isn't on by default presumably because
> it triggers too many sparse warnings for correct code.
> But virtio is now clean of these warnings, and
> we want to keep it this way - enable this for
> sparse builds.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> 
> It seems that there should be a better way to do it,
> but this works too.
> 
>  drivers/block/Makefile          | 1 +
>  drivers/char/Makefile           | 1 +
>  drivers/char/hw_random/Makefile | 2 ++
>  drivers/gpu/drm/virtio/Makefile | 1 +
>  drivers/net/Makefile            | 3 +++
>  drivers/net/caif/Makefile       | 1 +
>  drivers/rpmsg/Makefile          | 1 +
>  drivers/s390/virtio/Makefile    | 2 ++
>  drivers/scsi/Makefile           | 1 +
>  drivers/vhost/Makefile          | 1 +
>  drivers/virtio/Makefile         | 3 +++
>  net/9p/Makefile                 | 1 +
>  net/packet/Makefile             | 1 +
>  net/vmw_vsock/Makefile          | 2 ++
>  14 files changed, 21 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

Patch
diff mbox

diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 1e9661e..597481c 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -27,6 +27,7 @@  obj-$(CONFIG_BLK_DEV_OSD)	+= osdblk.o
 obj-$(CONFIG_BLK_DEV_UMEM)	+= umem.o
 obj-$(CONFIG_BLK_DEV_NBD)	+= nbd.o
 obj-$(CONFIG_BLK_DEV_CRYPTOLOOP) += cryptoloop.o
+CFLAGS_virtio_blk.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_VIRTIO_BLK)	+= virtio_blk.o
 
 obj-$(CONFIG_BLK_DEV_SX8)	+= sx8.o
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 6e6c244..a99467d 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -6,6 +6,7 @@  obj-y				+= mem.o random.o
 obj-$(CONFIG_TTY_PRINTK)	+= ttyprintk.o
 obj-y				+= misc.o
 obj-$(CONFIG_ATARI_DSP56K)	+= dsp56k.o
+CFLAGS_virtio_console.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_VIRTIO_CONSOLE)	+= virtio_console.o
 obj-$(CONFIG_RAW_DRIVER)	+= raw.o
 obj-$(CONFIG_SGI_SNSC)		+= snsc.o snsc_event.o
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 5f52b1e..a2b0931 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -17,6 +17,8 @@  obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
 obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o
 obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
+CFLAGS_virtio_transport.o += -D__CHECK_ENDIAN__
+CFLAGS_virtio-rng.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
 obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
 obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
diff --git a/drivers/gpu/drm/virtio/Makefile b/drivers/gpu/drm/virtio/Makefile
index 3fb8eac..1162366 100644
--- a/drivers/gpu/drm/virtio/Makefile
+++ b/drivers/gpu/drm/virtio/Makefile
@@ -3,6 +3,7 @@ 
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
 ccflags-y := -Iinclude/drm
+ccflags-y += -D__CHECK_ENDIAN__
 
 virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_drm_bus.o virtgpu_gem.o \
 	virtgpu_fb.o virtgpu_display.o virtgpu_vq.o virtgpu_ttm.o \
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 7336cbd..3f587de 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -12,6 +12,7 @@  obj-$(CONFIG_EQUALIZER) += eql.o
 obj-$(CONFIG_IFB) += ifb.o
 obj-$(CONFIG_MACSEC) += macsec.o
 obj-$(CONFIG_MACVLAN) += macvlan.o
+CFLAGS_macvtap.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_MACVTAP) += macvtap.o
 obj-$(CONFIG_MII) += mii.o
 obj-$(CONFIG_MDIO) += mdio.o
@@ -20,8 +21,10 @@  obj-$(CONFIG_NETCONSOLE) += netconsole.o
 obj-$(CONFIG_PHYLIB) += phy/
 obj-$(CONFIG_RIONET) += rionet.o
 obj-$(CONFIG_NET_TEAM) += team/
+CFLAGS_tun.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_TUN) += tun.o
 obj-$(CONFIG_VETH) += veth.o
+CFLAGS_virtio_net.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
 obj-$(CONFIG_VXLAN) += vxlan.o
 obj-$(CONFIG_GENEVE) += geneve.o
diff --git a/drivers/net/caif/Makefile b/drivers/net/caif/Makefile
index 9bbd453..d1a922c 100644
--- a/drivers/net/caif/Makefile
+++ b/drivers/net/caif/Makefile
@@ -12,3 +12,4 @@  obj-$(CONFIG_CAIF_HSI) += caif_hsi.o
 
 # Virtio interface
 obj-$(CONFIG_CAIF_VIRTIO) += caif_virtio.o
+CFLAGS_caif_virtio.o += -D__CHECK_ENDIAN__
diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
index ae9c913..23c8b66 100644
--- a/drivers/rpmsg/Makefile
+++ b/drivers/rpmsg/Makefile
@@ -1,3 +1,4 @@ 
 obj-$(CONFIG_RPMSG)		+= rpmsg_core.o
 obj-$(CONFIG_RPMSG_QCOM_SMD)	+= qcom_smd.o
 obj-$(CONFIG_RPMSG_VIRTIO)	+= virtio_rpmsg_bus.o
+CFLAGS_virtio_rpmsg_bus.o	+= -D__CHECK_ENDIAN__
diff --git a/drivers/s390/virtio/Makefile b/drivers/s390/virtio/Makefile
index df40692..270ada5 100644
--- 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
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 38d938d..9f70d46 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -135,6 +135,7 @@  obj-$(CONFIG_SCSI_BNX2_ISCSI)	+= libiscsi.o bnx2i/
 obj-$(CONFIG_BE2ISCSI)		+= libiscsi.o be2iscsi/
 obj-$(CONFIG_SCSI_ESAS2R)	+= esas2r/
 obj-$(CONFIG_SCSI_PMCRAID)	+= pmcraid.o
+CFLAGS_virtio_scsi.o += -D__CHECK_ENDIAN__
 obj-$(CONFIG_SCSI_VIRTIO)	+= virtio_scsi.o
 obj-$(CONFIG_VMWARE_PVSCSI)	+= vmw_pvscsi.o
 obj-$(CONFIG_XEN_SCSI_FRONTEND)	+= xen-scsifront.o
diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile
index 6b012b9..619e2cd 100644
--- a/drivers/vhost/Makefile
+++ b/drivers/vhost/Makefile
@@ -1,3 +1,4 @@ 
+ccflags-y := -D__CHECK_ENDIAN__
 obj-$(CONFIG_VHOST_NET) += vhost_net.o
 vhost_net-y := net.o
 
diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
index 41e30e3..d331f19 100644
--- a/drivers/virtio/Makefile
+++ b/drivers/virtio/Makefile
@@ -1,3 +1,6 @@ 
+#virtio must be kept clean wrt endian tags,
+#otherwise we'll get to maintain broken host/guest ABIs
+ccflags-y := -D__CHECK_ENDIAN__
 obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
 obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
 obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
diff --git a/net/9p/Makefile b/net/9p/Makefile
index a0874cc..acf1225 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -11,6 +11,7 @@  obj-$(CONFIG_NET_9P_RDMA) += 9pnet_rdma.o
 	trans_fd.o \
 	trans_common.o \
 
+CFLAGS_trans_virtio.o += -D__CHECK_ENDIAN__
 9pnet_virtio-objs := \
 	trans_virtio.o \
 
diff --git a/net/packet/Makefile b/net/packet/Makefile
index 9df6134..a13bcb3 100644
--- a/net/packet/Makefile
+++ b/net/packet/Makefile
@@ -2,6 +2,7 @@ 
 # Makefile for the packet AF.
 #
 
+ccflags-y := -D__CHECK_ENDIAN__
 obj-$(CONFIG_PACKET) += af_packet.o
 obj-$(CONFIG_PACKET_DIAG) += af_packet_diag.o
 af_packet_diag-y += diag.o
diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile
index bc27c70..a61eccb 100644
--- a/net/vmw_vsock/Makefile
+++ b/net/vmw_vsock/Makefile
@@ -8,6 +8,8 @@  vsock-y += af_vsock.o vsock_addr.o
 vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \
 	vmci_transport_notify_qstate.o
 
+CFLAGS_virtio_transport.o += -D__CHECK_ENDIAN__
+CFLAGS_virtio_transport_common.o += -D__CHECK_ENDIAN__
 vmw_vsock_virtio_transport-y += virtio_transport.o
 
 vmw_vsock_virtio_transport_common-y += virtio_transport_common.o