linux-kernel - Re: [PATCH v2] media: venus: Constify struct dec_bufsize_ops and enc_bufsize

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Date: Tue, 4 Jun 2024 00:02:08 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 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,
 linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2] media: venus: Constify struct dec_bufsize_ops and
 enc_bufsize_ops

On 02/06/2024 15:27, Christophe JAILLET wrote:
> "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>
> ---
> Changes in v2:
>     - Add missing prefix in the subject
> 
> v1: https://lore.kernel.org/all/9bc4b28a55c42fa4a125c3e03d4c8b0f208550b4.1717313173.git.christophe.jaillet@wanadoo.fr/
> 
> While looking at lore to find the reference above, I found that this
> patch had already been sent by Rikard Falkeborn <rikard.falkeborn@...il.com>
> See: https://lore.kernel.org/all/20211212123534.4473-1-rikard.falkeborn@gmail.com/
> 
> So, if applied, credits should be for him.
> So feel free to add a Co-Developed-by:, Reported-by:, Suggested-by: or
> whatever makes sense, including removing my Signed-off-by: to put his if
> it sounds better to do it this way.
> 
>   .../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;

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>