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From: Ricardo Ribalda <ribalda@chromium.org>
To: Michael Tretter <m.tretter@pengutronix.de>,
	Ricardo Ribalda <ribalda@chromium.org>,
	 Pengutronix Kernel Team <kernel@pengutronix.de>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Michal Simek <michal.simek@amd.com>,
	 Andy Walls <awalls@md.metrocast.net>,
	Stanimir Varbanov <stanimir.k.varbanov@gmail.com>,
	 Vikash Garodia <quic_vgarodia@quicinc.com>,
	"Bryan O'Donoghue" <bryan.odonoghue@linaro.org>,
	 Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	 linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org,
	 Hans Verkuil <hverkuil-cisco@xs4all.nl>
Subject: Re: [PATCH v2 01/18] media: allegro: nal-hevc: Refactor nal_hevc_sub_layer_hrd_parameters
Date: Thu, 9 May 2024 20:50:14 +0200	[thread overview]
Message-ID: <CANiDSCvon2eW4aHk8JD2_GDR9hG1FBhgbCOEZ+W2RC2HHsXM5A@mail.gmail.com> (raw)
In-Reply-To: <Zjs9h40l9gfaiOei@pengutronix.de>

Hi Michael

On Wed, 8 May 2024 at 10:53, Michael Tretter <m.tretter@pengutronix.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@chromium.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

  reply	other threads:[~2024-05-09 18:50 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-07 16:27 [PATCH v2 00/18] media: Fix the last set of coccinelle warnings Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 01/18] media: allegro: nal-hevc: Refactor nal_hevc_sub_layer_hrd_parameters Ricardo Ribalda
2024-05-08  8:53   ` Michael Tretter
2024-05-09 18:50     ` Ricardo Ribalda [this message]
2024-05-07 16:27 ` [PATCH v2 02/18] media: xilinx: Refactor struct xvip_dma Ricardo Ribalda
2024-05-07 19:34   ` Laurent Pinchart
2024-05-07 16:27 ` [PATCH v2 03/18] media: dvb-frontend/mxl5xx: Refactor struct MBIN_FILE_T Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 04/18] media: dvb-frontend/mxl5xx: Use flex array for MBIN_SEGMENT_T Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 05/18] media: pci: cx18: Use flex arrays for struct cx18_scb Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 06/18] media: siano: Refactor struct sms_msg_data Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 07/18] media: siano: Remove unused structures Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 08/18] media: siano: Use flex arrays for sms_firmware Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 09/18] media: venus: Remove unused structs Ricardo Ribalda
2024-05-09 23:35   ` Bryan O'Donoghue
2024-05-09 23:55     ` Bryan O'Donoghue
2024-05-22 12:28       ` Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 10/18] media: venus: Use flex array for hfi_session_release_buffer_pkt Ricardo Ribalda
2024-05-09 23:37   ` Bryan O'Donoghue
2024-05-10  0:10     ` Bryan O'Donoghue
2024-05-22 12:54       ` Ricardo Ribalda
2024-05-07 16:27 ` [PATCH v2 11/18] media: venus: Refactor struct hfi_uncompressed_plane_info Ricardo Ribalda
2024-05-09 23:38   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 12/18] media: venus: Refactor struct hfi_session_get_property_pkt Ricardo Ribalda
2024-05-09 23:43   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 13/18] media: venus: Refactor struct hfi_uncompressed_format_supported Ricardo Ribalda
2024-05-09 23:56   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 14/18] media: venus: Refactor hfi_session_empty_buffer_uncompressed_plane0_pkt Ricardo Ribalda
2024-05-09 23:58   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 15/18] media: venus: Refactor hfi_session_empty_buffer_compressed_pkt Ricardo Ribalda
2024-05-09 23:59   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 16/18] media: venus: Refactor hfi_sys_get_property_pkt Ricardo Ribalda
2024-05-10  0:05   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 17/18] media: venus: Refactor hfi_session_fill_buffer_pkt Ricardo Ribalda
2024-05-10  0:06   ` Bryan O'Donoghue
2024-05-07 16:27 ` [PATCH v2 18/18] media: venus: Refactor hfi_buffer_alloc_mode_supported Ricardo Ribalda
2024-05-10  0:09   ` Bryan O'Donoghue
2024-05-22 13:03     ` Ricardo Ribalda

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