On Tue, Mar 25, 2014 at 7:10 AM, Thierry Reding
<thierry.reding@xxxxxxxxx> wrote:
> On Mon, Mar 24, 2014 at 05:42:26PM +0900, Alexandre Courbot wrote:
> [...]
>> diff --git a/drivers/gpu/drm/nouveau/core/subdev/bar/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/bar/nvc0.c
> [...]
>> static int
>> -nvc0_bar_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
>> - struct nouveau_oclass *oclass, void *data, u32 size,
>> - struct nouveau_object **pobject)
>> +nvc0_bar_init_vm(struct nvc0_bar_priv *priv, int nr, int bar)
>> {
> [...]
>> - /* BAR3 */
>> ret = nouveau_gpuobj_new(nv_object(priv), NULL, 0x1000, 0, 0,
>> - &priv->bar[0].mem);
>> - mem = priv->bar[0].mem;
>> + &priv->bar[nr].mem);
>> + mem = priv->bar[nr].mem;
>> if (ret)
>> return ret;
>>
>> ret = nouveau_gpuobj_new(nv_object(priv), NULL, 0x8000, 0, 0,
>> - &priv->bar[0].pgd);
>> + &priv->bar[nr].pgd);
>> if (ret)
>> return ret;
> [...]
>> +static int
>> +nvc0_bar_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
>> + struct nouveau_oclass *oclass, void *data, u32 size,
>> + struct nouveau_object **pobject)
>> +{
> [...]
>> + /* BAR3 */
>> + if (has_bar3) {
>> + ret = nvc0_bar_init_vm(priv, 0, 3);
> [...]
>> + /* BAR1 */
>> + ret = nvc0_bar_init_vm(priv, 1, 1);
>> if (ret)
>> return ret;
>
> The calls to nvc0_bar_init_vm() are somewhat confusing in my opinion. It
> is hard to see from the invocation what these numbers mean and therefore
> distinguish which parameter is which.
>
> Perhaps a slightly more readable way would be to pass in a pointer to a
> structure as second parameter instead of the index into an array. So
> it'd look somewhat like this:
>
> if (has_bar3) {
> ret = nvc0_bar_init_vm(priv, &priv->bar[0], 3);
> ...
> }
> ...
> ret = nvc0_bar_init_vm(priv, &priv->bar[1], 1);
> ...
>
> Unfortunately that would require a new type to be created for the bar[]
> structures, so it'd be slightly more intrusive.
These types are local to nvc0.c anyway, so I don't think it would
hurt. And you are right that the code would become more readable as a
result, passing array indexes as arguments is not a common practice
(and should not be).
Alex.
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