Re: [PATCH][next] drm/nouveau: Avoid -Wflex-array-member-not-at-end warning

[Danilo Krummrich <dakr@xxxxxxxxxx>]

Hi,

On 9/13/24 10:09 AM, Gustavo A. R. Silva wrote:
> Hi all,
>
> Friendly ping: who can take this, please? 🙂

Usually, that's me. But I thought you might want to send a v2 based on Kees'
comments?

- Danilo

> Thanks
> -Gustavo
>
> On 21/08/24 22:16, Gustavo A. R. Silva wrote:
> > Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> > a flexible structure where the size of the flexible-array member
> > is known at compile-time, and refactor the rest of the code,
> > accordingly.
> >
> > So, with this, fix the following warning:
> >
> > drivers/gpu/drm/nouveau/dispnv50/disp.c:779:47: warning: structure containing 
> > a flexible array member is not at the end of another structure 
> > [-Wflex-array-member-not-at-end]
> >
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/nouveau/dispnv50/disp.c | 20 +++++++++-----------
> >   1 file changed, 9 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c 
> > b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > index eed579a6c858..ddddc69640be 100644
> > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > @@ -774,11 +774,9 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct 
> > nouveau_crtc *nv_crtc,
> >       struct drm_hdmi_info *hdmi = &nv_connector->base.display_info.hdmi;
> >       union hdmi_infoframe infoframe = { 0 };
> >       const u8 rekey = 56; /* binary driver, and tegra, constant */
> > +    DEFINE_RAW_FLEX(struct nvif_outp_infoframe_v0, args, data, 17);
> > +    const u8 data_len = 17; /* same length as in DEFINE_RAW_FLEX above. */
> >       u32 max_ac_packet;
> > -    struct {
> > -        struct nvif_outp_infoframe_v0 infoframe;
> > -        u8 data[17];
> > -    } args = { 0 };
> >       int ret, size;
> >       max_ac_packet  = mode->htotal - mode->hdisplay;
> > @@ -815,29 +813,29 @@ nv50_hdmi_enable(struct drm_encoder *encoder, struct 
> > nouveau_crtc *nv_crtc,
> >           return;
> >       /* AVI InfoFrame. */
> > -    args.infoframe.version = 0;
> > -    args.infoframe.head = nv_crtc->index;
> > +    args->version = 0;
> > +    args->head = nv_crtc->index;
> >       if (!drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi, 
> > &nv_connector->base, mode)) {
> >           drm_hdmi_avi_infoframe_quant_range(&infoframe.avi, 
> > &nv_connector->base, mode,
> >                              HDMI_QUANTIZATION_RANGE_FULL);
> > -        size = hdmi_infoframe_pack(&infoframe, args.data, 
> > ARRAY_SIZE(args.data));
> > +        size = hdmi_infoframe_pack(&infoframe, args->data, data_len);
> >       } else {
> >           size = 0;
> >       }
> > -    nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, 
> > &args.infoframe, size);
> > +    nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_AVI, args, 
> > size);
> >       /* Vendor InfoFrame. */
> > -    memset(&args.data, 0, sizeof(args.data));
> > +    memset(args->data, 0, data_len);
> >       if (!drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
> >                                &nv_connector->base, mode))
> > -        size = hdmi_infoframe_pack(&infoframe, args.data, 
> > ARRAY_SIZE(args.data));
> > +        size = hdmi_infoframe_pack(&infoframe, args->data, data_len);
> >       else
> >           size = 0;
> > -    nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, 
> > &args.infoframe, size);
> > +    nvif_outp_infoframe(&nv_encoder->outp, NVIF_OUTP_INFOFRAME_V0_VSI, args, 
> > size);
> >       nv_encoder->hdmi.enabled = true;
> >   }