linux-kernel - Re: [PATCH] drm/bridge: Constify struct i2c_device

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Message-ID: <71348ac9-07bf-460f-a200-653f57ed4061@wanadoo.fr>
Date: Wed, 13 Nov 2024 22:19:24 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Jagan Teki <jagan@...rulasolutions.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Douglas Anderson <dianders@...omium.org>, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/bridge: Constify struct i2c_device_id

Le 12/11/2024 à 23:43, Laurent Pinchart a écrit :
> Hi Christophe,
> 
> Thank you for the patch.
> 
> On Tue, Nov 12, 2024 at 10:12:25PM +0100, Christophe JAILLET wrote:
>> 'struct i2c_device_id' is not modified in these drivers.
>>
>> Constifying this structure moves some data to a read-only section, so
>> increase overall security.
>>
>> On a x86_64, with allmodconfig, as an example:
>> Before:
>> ======
>>     text	   data	    bss	    dec	    hex	filename
>>    15566	    987	     32	  16585	   40c9	drivers/gpu/drm/bridge/chipone-icn6211.o
>>
>> After:
>> =====
>>     text	   data	    bss	    dec	    hex	filename
>>    15630	    923	     32	  16585	   40c9	drivers/gpu/drm/bridge/chipone-icn6211.o
>>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>> Compile tested-only.
>> ---
>>   drivers/gpu/drm/bridge/chipone-icn6211.c   | 2 +-
>>   drivers/gpu/drm/bridge/lontium-lt9211.c    | 2 +-
>>   drivers/gpu/drm/bridge/lontium-lt9611.c    | 2 +-
>>   drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +-
>>   drivers/gpu/drm/bridge/ti-sn65dsi83.c      | 2 +-
>>   drivers/gpu/drm/bridge/ti-sn65dsi86.c      | 2 +-
> 
> While at it, could you address drivers/gpu/drm/i2c/tda9950.c too ? If I
> were to push a tad more, there are only two other drivers in the kernel
> with the same issues outside of drivers/gpu/ according to

Hi Laurent,

this is in my todo list. I wanted to send it separately because all 
these files are in gpu/drm/bridge/ and tda9950.c is in gpu/drm/.

Most of the times, maintainers ask for separate patches when several 
drivers are patched. For such clean-ups, I try at least to group them by 
directory.

Same answer the other files in input and sound. Patches will be sent in 
a few days.

I've also sent one for the documentation [1] and will send one for 
const_structs.checkpatch as well.

CJ

[1]: 
https://lore.kernel.org/linux-kernel/c8e6da4adb7381ee27e8e11854c9d856382cdc93.1731445244.git.christophe.jaillet@wanadoo.fr/

> 
> $ git grep '^static struct i2c_device_id'
> drivers/gpu/drm/bridge/chipone-icn6211.c:static struct i2c_device_id chipone_i2c_id[] = {
> drivers/gpu/drm/bridge/lontium-lt9211.c:static struct i2c_device_id lt9211_id[] = {
> drivers/gpu/drm/bridge/lontium-lt9611.c:static struct i2c_device_id lt9611_id[] = {
> drivers/gpu/drm/bridge/lontium-lt9611uxc.c:static struct i2c_device_id lt9611uxc_id[] = {
> drivers/gpu/drm/bridge/ti-sn65dsi83.c:static struct i2c_device_id sn65dsi83_id[] = {
> drivers/gpu/drm/bridge/ti-sn65dsi86.c:static struct i2c_device_id ti_sn65dsi86_id[] = {
> drivers/gpu/drm/i2c/tda9950.c:static struct i2c_device_id tda9950_ids[] = {
> drivers/input/keyboard/cypress-sf.c:static struct i2c_device_id cypress_sf_id_table[] = {
> sound/soc/codecs/cs42l51-i2c.c:static struct i2c_device_id cs42l51_i2c_id[] = {
> 
> :-)
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> 
>>   6 files changed, 6 insertions(+), 6 deletions(-)

...

CJ