Re: [Qemu-devel] [PATCH v2 0/3] virtio: cross-endian helpers fixes

[Greg Kurz <gkurz@linux.vnet.ibm.com>]

On Wed, 23 Dec 2015 17:28:23 +0100
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:

> On Wed, 23 Dec 2015 15:47:00 +0200
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > On Thu, Dec 17, 2015 at 09:52:46AM +0100, Greg Kurz wrote:
> > > This series tries to rework cross-endian helpers for better clarity.
> > > It does not change behaviour, except perhaps patch 3/3 even if I could not
> > > measure any performance gain.
> > 
> > Breaks build:
> > 
> >   CC    mips64-softmmu/hw/mips/mips_malta.o
> > /home/mst/scm/qemu/hw/net/vhost_net.c: In function
> > ‘vhost_net_set_vnet_endian’:
> > /home/mst/scm/qemu/hw/net/vhost_net.c:208:10: error: implicit
> > declaration of function ‘virtio_legacy_is_cross_endian’
> > [-Werror=implicit-function-declaration]
> >          (virtio_legacy_is_cross_endian(dev) &&
> > !virtio_is_big_endian(dev))) {
> >           ^
> > /home/mst/scm/qemu/hw/net/vhost_net.c:208:9: error: nested extern
> > declaration of ‘virtio_legacy_is_cross_endian’ [-Werror=nested-externs]
> >          (virtio_legacy_is_cross_endian(dev) &&
> > !virtio_is_big_endian(dev))) {
> >          ^
> > cc1: all warnings being treated as errors
> > /home/mst/scm/qemu/rules.mak:57: recipe for target 'hw/net/vhost_net.o'
> > failed
> > make[1]: *** [hw/net/vhost_net.o] Error 1
> > Makefile:186: recipe for target 'subdir-i386-softmmu' failed
> > make: *** [subdir-i386-softmmu] Error 2
> > 
> > 
> > please always build all architectures.
> > 
> 
> Ok. I'll do so from now on.
> 

The break isn't architecture related actually. It is because this series
depends on the "virtio-net/vhost-net: share cross-endian enablement" series
I had posted before... my bad. Since most of these series is cleanup of the
cross-endian code, I'll repost a single series with all the patches.

> > > ---
> > > 
> > > Greg Kurz (3):
> > >       virtio: move cross-endian helper to vhost
> > >       vhost: move virtio 1.0 check to cross-endian helper
> > >       virtio: optimize virtio_access_is_big_endian() for little-endian targets
> > > 
> > > 
> > >  hw/virtio/vhost.c                 |   22 ++++++++++++++++++----
> > >  include/hw/virtio/virtio-access.h |   16 +++-------------
> > >  2 files changed, 21 insertions(+), 17 deletions(-)
> > 
> 
>