linux-kernel - [PATCH] Constify struct dec_bufsize_ops and enc_bufsize

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Date: Sun,  2 Jun 2024 09:26:45 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
	Vikash Garodia <quic_vgarodia@...cinc.com>,
	"Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-media@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH] Constify struct dec_bufsize_ops and enc_bufsize_ops

"struct dec_bufsize_ops and "struct enc_bufsize_ops" are not modified in
this driver.

Constifying these structures moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
   text	   data	    bss	    dec	    hex	filename
  12494	    822	      0	  13316	   3404	drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.o

After:
   text	   data	    bss	    dec	    hex	filename
  12766	    566	      0	  13332	   3414	drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 .../platform/qcom/venus/hfi_plat_bufs_v6.c    | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.c b/drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.c
index f5a655973c08..6289166786ec 100644
--- a/drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.c
+++ b/drivers/media/platform/qcom/venus/hfi_plat_bufs_v6.c
@@ -1063,51 +1063,51 @@ struct enc_bufsize_ops {
 	u32 (*persist)(void);
 };
 
-static struct dec_bufsize_ops dec_h264_ops = {
+static const struct dec_bufsize_ops dec_h264_ops = {
 	.scratch = h264d_scratch_size,
 	.scratch1 = h264d_scratch1_size,
 	.persist1 = h264d_persist1_size,
 };
 
-static struct dec_bufsize_ops dec_h265_ops = {
+static const struct dec_bufsize_ops dec_h265_ops = {
 	.scratch = h265d_scratch_size,
 	.scratch1 = h265d_scratch1_size,
 	.persist1 = h265d_persist1_size,
 };
 
-static struct dec_bufsize_ops dec_vp8_ops = {
+static const struct dec_bufsize_ops dec_vp8_ops = {
 	.scratch = vpxd_scratch_size,
 	.scratch1 = vp8d_scratch1_size,
 	.persist1 = vp8d_persist1_size,
 };
 
-static struct dec_bufsize_ops dec_vp9_ops = {
+static const struct dec_bufsize_ops dec_vp9_ops = {
 	.scratch = vpxd_scratch_size,
 	.scratch1 = vp9d_scratch1_size,
 	.persist1 = vp9d_persist1_size,
 };
 
-static struct dec_bufsize_ops dec_mpeg2_ops = {
+static const struct dec_bufsize_ops dec_mpeg2_ops = {
 	.scratch = mpeg2d_scratch_size,
 	.scratch1 = mpeg2d_scratch1_size,
 	.persist1 = mpeg2d_persist1_size,
 };
 
-static struct enc_bufsize_ops enc_h264_ops = {
+static const struct enc_bufsize_ops enc_h264_ops = {
 	.scratch = h264e_scratch_size,
 	.scratch1 = h264e_scratch1_size,
 	.scratch2 = enc_scratch2_size,
 	.persist = enc_persist_size,
 };
 
-static struct enc_bufsize_ops enc_h265_ops = {
+static const struct enc_bufsize_ops enc_h265_ops = {
 	.scratch = h265e_scratch_size,
 	.scratch1 = h265e_scratch1_size,
 	.scratch2 = enc_scratch2_size,
 	.persist = enc_persist_size,
 };
 
-static struct enc_bufsize_ops enc_vp8_ops = {
+static const struct enc_bufsize_ops enc_vp8_ops = {
 	.scratch = vp8e_scratch_size,
 	.scratch1 = vp8e_scratch1_size,
 	.scratch2 = enc_scratch2_size,
@@ -1186,7 +1186,7 @@ static int bufreq_dec(struct hfi_plat_buffers_params *params, u32 buftype,
 	u32 codec = params->codec;
 	u32 width = params->width, height = params->height, out_min_count;
 	u32 out_width = params->out_width, out_height = params->out_height;
-	struct dec_bufsize_ops *dec_ops;
+	const struct dec_bufsize_ops *dec_ops;
 	bool is_secondary_output = params->dec.is_secondary_output;
 	bool is_interlaced = params->dec.is_interlaced;
 	u32 max_mbs_per_frame = params->dec.max_mbs_per_frame;
@@ -1260,7 +1260,7 @@ static int bufreq_enc(struct hfi_plat_buffers_params *params, u32 buftype,
 		      struct hfi_buffer_requirements *bufreq)
 {
 	enum hfi_version version = params->version;
-	struct enc_bufsize_ops *enc_ops;
+	const struct enc_bufsize_ops *enc_ops;
 	u32 width = params->width;
 	u32 height = params->height;
 	bool is_tenbit = params->enc.is_tenbit;
-- 
2.45.1