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Message-ID: <CANiDSCvon2eW4aHk8JD2_GDR9hG1FBhgbCOEZ+W2RC2HHsXM5A@mail.gmail.com>
Date: Thu, 9 May 2024 20:50:14 +0200
From: Ricardo Ribalda <ribalda@...omium.org>
To: Michael Tretter <m.tretter@...gutronix.de>, Ricardo Ribalda <ribalda@...omium.org>,
Pengutronix Kernel Team <kernel@...gutronix.de>, Mauro Carvalho Chehab <mchehab@...nel.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>, Michal Simek <michal.simek@....com>,
Andy Walls <awalls@...metrocast.net>, Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
Vikash Garodia <quic_vgarodia@...cinc.com>, "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
Hans Verkuil <hverkuil-cisco@...all.nl>
Subject: Re: [PATCH v2 01/18] media: allegro: nal-hevc: Refactor nal_hevc_sub_layer_hrd_parameters
Hi Michael
On Wed, 8 May 2024 at 10:53, Michael Tretter <m.tretter@...gutronix.de> wrote:
>
> On Tue, 07 May 2024 16:27:06 +0000, Ricardo Ribalda wrote:
> > Replace all the single elements arrays with the element itself.
> >
> > Pahole shows the same padding and alignment for x86 and arm in both
> > situations.
> >
> > This fixes this cocci warning:
> > drivers/media/platform/allegro-dvt/nal-hevc.h:102:14-22: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)
>
> Thanks for the patch.
>
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > ---
> > drivers/media/platform/allegro-dvt/allegro-core.c | 6 +++---
> > drivers/media/platform/allegro-dvt/nal-hevc.c | 11 +++--------
> > drivers/media/platform/allegro-dvt/nal-hevc.h | 6 +++---
> > 3 files changed, 9 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/media/platform/allegro-dvt/allegro-core.c b/drivers/media/platform/allegro-dvt/allegro-core.c
> > index da61f9beb6b4..369bd88cc0ae 100644
> > --- a/drivers/media/platform/allegro-dvt/allegro-core.c
> > +++ b/drivers/media/platform/allegro-dvt/allegro-core.c
> > @@ -1852,14 +1852,14 @@ static ssize_t allegro_hevc_write_sps(struct allegro_channel *channel,
> > hrd->dpb_output_delay_length_minus1 = 30;
> >
> > hrd->bit_rate_scale = ffs(channel->bitrate_peak) - 6;
> > - hrd->vcl_hrd[0].bit_rate_value_minus1[0] =
> > + hrd->vcl_hrd[0].bit_rate_value_minus1 =
> > (channel->bitrate_peak >> (6 + hrd->bit_rate_scale)) - 1;
> >
> > cpb_size = v4l2_ctrl_g_ctrl(channel->mpeg_video_cpb_size) * 1000;
> > hrd->cpb_size_scale = ffs(cpb_size) - 4;
> > - hrd->vcl_hrd[0].cpb_size_value_minus1[0] = (cpb_size >> (4 + hrd->cpb_size_scale)) - 1;
> > + hrd->vcl_hrd[0].cpb_size_value_minus1 = (cpb_size >> (4 + hrd->cpb_size_scale)) - 1;
> >
> > - hrd->vcl_hrd[0].cbr_flag[0] = !v4l2_ctrl_g_ctrl(channel->mpeg_video_frame_rc_enable);
> > + hrd->vcl_hrd[0].cbr_flag = !v4l2_ctrl_g_ctrl(channel->mpeg_video_frame_rc_enable);
> >
> > size = nal_hevc_write_sps(&dev->plat_dev->dev, dest, n, sps);
> >
> > diff --git a/drivers/media/platform/allegro-dvt/nal-hevc.c b/drivers/media/platform/allegro-dvt/nal-hevc.c
> > index 9cdf2756e0a3..575089522df5 100644
> > --- a/drivers/media/platform/allegro-dvt/nal-hevc.c
> > +++ b/drivers/media/platform/allegro-dvt/nal-hevc.c
> > @@ -210,14 +210,9 @@ static void nal_hevc_rbsp_vps(struct rbsp *rbsp, struct nal_hevc_vps *vps)
> > static void nal_hevc_rbsp_sub_layer_hrd_parameters(struct rbsp *rbsp,
> > struct nal_hevc_sub_layer_hrd_parameters *hrd)
> > {
> > - unsigned int i;
> > - unsigned int cpb_cnt = 1;
> > -
> > - for (i = 0; i < cpb_cnt; i++) {
> > - rbsp_uev(rbsp, &hrd->bit_rate_value_minus1[i]);
> > - rbsp_uev(rbsp, &hrd->cpb_size_value_minus1[i]);
> > - rbsp_bit(rbsp, &hrd->cbr_flag[i]);
> > - }
> > + rbsp_uev(rbsp, &hrd->bit_rate_value_minus1);
> > + rbsp_uev(rbsp, &hrd->cpb_size_value_minus1);
> > + rbsp_bit(rbsp, &hrd->cbr_flag);
> > }
> >
> > static void nal_hevc_rbsp_hrd_parameters(struct rbsp *rbsp,
> > diff --git a/drivers/media/platform/allegro-dvt/nal-hevc.h b/drivers/media/platform/allegro-dvt/nal-hevc.h
> > index eb46f12aae80..afa7a9d7d654 100644
> > --- a/drivers/media/platform/allegro-dvt/nal-hevc.h
> > +++ b/drivers/media/platform/allegro-dvt/nal-hevc.h
> > @@ -97,9 +97,9 @@ struct nal_hevc_vps {
> > };
> >
> > struct nal_hevc_sub_layer_hrd_parameters {
> > - unsigned int bit_rate_value_minus1[1];
> > - unsigned int cpb_size_value_minus1[1];
> > - unsigned int cbr_flag[1];
> > + unsigned int bit_rate_value_minus1;
> > + unsigned int cpb_size_value_minus1;
> > + unsigned int cbr_flag;
>
> The struct is modeled after the specification in ITU-T H.265, which
> defines the fields as arrays. It's a limitation of the current
> implementation that only a single element is supported.
>
> Maybe replacing the hard coded values with a constant would be more
> appropriate to document this limitation.
A define seems to convince coccinelle of our intentions :). I will
upload the fix in v3
diff --git a/drivers/media/platform/allegro-dvt/nal-hevc.h
b/drivers/media/platform/allegro-dvt/nal-hevc.h
index eb46f12aae80..361e2f55c254 100644
--- a/drivers/media/platform/allegro-dvt/nal-hevc.h
+++ b/drivers/media/platform/allegro-dvt/nal-hevc.h
@@ -96,10 +96,11 @@ struct nal_hevc_vps {
unsigned int extension_data_flag;
};
+#define N_HRD_PARAMS 1
struct nal_hevc_sub_layer_hrd_parameters {
- unsigned int bit_rate_value_minus1[1];
- unsigned int cpb_size_value_minus1[1];
- unsigned int cbr_flag[1];
+ unsigned int bit_rate_value_minus1[N_HRD_PARAMS];
+ unsigned int cpb_size_value_minus1[N_HRD_PARAMS];
+ unsigned int cbr_flag[N_HRD_PARAMS];
};
struct nal_hevc_hrd_parameters {
Thanks.
>
> Michael
>
> > };
> >
> > struct nal_hevc_hrd_parameters {
> >
> > --
> > 2.45.0.rc1.225.g2a3ae87e7f-goog
> >
> >
--
Ricardo Ribalda
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