Re: [Xen-devel] [RFC 08/24] xen/dts: Don't add a fake property "name" in the device tree

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-08-16 at 22:05 +0100, Julien Grall wrote:
> On new Flat Device Tree version, the property "name" may not exist.
> The property is never used in Xen code except to set the field "name" of
> dt_device_node.
> 
> For convenience, remove the fake property. It will save space during the
> creation of the dom0 FDT.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> ---
>  xen/common/device_tree.c |   21 +++++++++------------
>  1 file changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 362dd66..315b284 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -1528,6 +1528,7 @@ static unsigned long __init unflatten_dt_node(const 
> void *fdt,
>      if ( !has_name )
>      {
>          char *p1 = pathp, *ps = pathp, *pa = NULL;
> +        char *tmp = NULL;
>          int sz;
>  
>          while ( *p1 )
> @@ -1541,25 +1542,21 @@ static unsigned long __init unflatten_dt_node(const 
> void *fdt,
>          if ( pa < ps )
>              pa = p1;
>          sz = (pa - ps) + 1;
> -        pp = unflatten_dt_alloc(&mem, sizeof(struct dt_property) + sz,
> -                                __alignof__(struct dt_property));

pp appears to not be assigned anywhere else now? I'm not sure if prev_pp
becomes obsolete or not.

> +
> +        tmp = unflatten_dt_alloc(&mem, sz, 1);
>          if ( allnextpp )
>          {
> -            pp->name = "name";
> -            pp->length = sz;
> -            pp->value = pp + 1;
> -            *prev_pp = pp;
> -            prev_pp = &pp->next;
> -            memcpy(pp->value, ps, sz - 1);
> -            ((char *)pp->value)[sz - 1] = 0;
> -            dt_dprintk("fixed up name for %s -> %s\n", pathp,
> -                       (char *)pp->value);
> +            memcpy(tmp, ps, sz - 1);
> +            np->name = tmp;
> +            tmp[sz - 1] = 0;
> +            dt_dprintk("fixed up name for %s -> %s\n", pathp, np->name);
>          }
>      }
> +
>      if ( allnextpp )
>      {
>          *prev_pp = NULL;
> -        np->name = dt_get_property(np, "name", NULL);
> +        np->name = (np->name) ? : dt_get_property(np, "name", NULL);
>          np->type = dt_get_property(np, "device_type", NULL);
>  
>          if ( !np->name )



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