Re: [PATCH v4 3/3] vl: Abort if multiple machines are registered as default

["Marc-André Lureau" <marcandre.lureau@gmail.com>]

On Fri, Feb 7, 2020 at 5:21 PM Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> It would be confusing to have multiple default machines.
> Abort if this ever occurs.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> v2: Use assert() instead of human friendly message (Marc-André)
> v3: Move the check to find_machine() (Michael)
>
> Cc: Marc-André Lureau <marcandre.lureau@gmail.com>
> Cc: Laurent Vivier <laurent@vivier.eu>
> Cc: Michael S. Tsirkin <mst@redhat.com>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>


> ---
>  vl.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/vl.c b/vl.c
> index 7dcb0879c4..ebc203af0d 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1184,16 +1184,18 @@ static MachineClass *find_machine(const char *name, GSList *machines)
>  static MachineClass *find_default_machine(GSList *machines)
>  {
>      GSList *el;
> +    MachineClass *default_machineclass = NULL;
>
>      for (el = machines; el; el = el->next) {
>          MachineClass *mc = el->data;
>
>          if (mc->is_default) {
> -            return mc;
> +            assert(default_machineclass == NULL && "Multiple default machines");
> +            default_machineclass = mc;
>          }
>      }
>
> -    return NULL;
> +    return default_machineclass;
>  }
>
>  static int machine_help_func(QemuOpts *opts, MachineState *machine)
> --
> 2.21.1
>


-- 
Marc-André Lureau