linux-kernel - [PATCH v2 01/18] media: allegro: nal-hevc: Refactor nal_hevc_sub_layer_hrd

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Message-Id: <20240507-cocci-flexarray-v2-1-7aea262cf065@chromium.org>
Date: Tue, 07 May 2024 16:27:06 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Michael Tretter <m.tretter@...gutronix.de>, 
 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>
Cc: 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>, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 01/18] media: allegro: nal-hevc: Refactor
 nal_hevc_sub_layer_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@...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;
 };
 
 struct nal_hevc_hrd_parameters {

-- 
2.45.0.rc1.225.g2a3ae87e7f-goog