| Message ID | 20240507-cocci-flexarray-v2-1-7aea262cf065@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: Fix the last set of coccinelle warnings | expand |
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. Michael > }; > > struct nal_hevc_hrd_parameters { > > -- > 2.45.0.rc1.225.g2a3ae87e7f-goog > >
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
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; }; struct nal_hevc_hrd_parameters {
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) 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(-)