Re: [PATCH v6 6/8] virtio: add explicit big-endian support to memory accessors

[Cornelia Huck]

On Fri, 24 Apr 2015 14:26:24 +0200
Greg Kurz <gkurz@xxxxxxxxxxxxxxxxxx> wrote:

> The current memory accessors logic is:
> - little endian if little_endian
> - native endian (i.e. no byteswap) if !little_endian
> 
> If we want to fully support cross-endian vhost, we also need to be
> able to convert to big endian.
> 
> Instead of changing the little_endian argument to some 3-value enum, this
> patch changes the logic to:
> - little endian if little_endian
> - big endian if !little_endian
> 
> The native endian case is handled by all users with a trivial helper. This
> patch doesn't change any functionality, nor it does add overhead.
> 
> Signed-off-by: Greg Kurz <gkurz@xxxxxxxxxxxxxxxxxx>
> ---
> 
> Changes since v5:
> - changed endian checking helpers as suggested by Thomas (use || and line
>   breaker)
> 
>  drivers/net/macvtap.c            |    3 ++-
>  drivers/net/tun.c                |    3 ++-
>  drivers/vhost/vhost.h            |    3 ++-
>  include/linux/virtio_byteorder.h |   24 ++++++++++++++----------
>  include/linux/virtio_config.h    |    3 ++-
>  include/linux/vringh.h           |    3 ++-
>  6 files changed, 24 insertions(+), 15 deletions(-)
> 

Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>

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