linux-kernel - Re: [PATCH] drm/radeon: Constify struct pci_device

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Message-ID: <acd637f7-a1ce-443b-8d05-d285c28cea7d@amd.com>
Date: Mon, 18 Nov 2024 12:24:56 +0100
From: Christian König <christian.koenig@....com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>, linux@...ssschuh.net,
 broonie@...nel.org, lee@...nel.org, Alex Deucher
 <alexander.deucher@....com>, Xinhui Pan <Xinhui.Pan@....com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
 amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/radeon: Constify struct pci_device_id

Am 15.11.24 um 18:26 schrieb Christophe JAILLET:
> 'struct pci_device_id' is not modified in this driver.
>
> Constifying this structure 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
>    11984	  28672	     44	  40700	   9efc	drivers/gpu/drm/radeon/radeon_drv.o
>
> After:
> =====
>     text	   data	    bss	    dec	    hex	filename
>    40000	    664	     44	  40708	   9f04	drivers/gpu/drm/radeon/radeon_drv.o

Mhm that's a bit more than "some data" :)

> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Acked-by: Christian König <christian.koenig@....com>

> ---
> Compile tested-only.
> ---
>   drivers/gpu/drm/radeon/radeon_drv.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 23d6d1a2586d..5e958cc223f4 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -248,10 +248,9 @@ int radeon_cik_support = 1;
>   MODULE_PARM_DESC(cik_support, "CIK support (1 = enabled (default), 0 = disabled)");
>   module_param_named(cik_support, radeon_cik_support, int, 0444);
>   
> -static struct pci_device_id pciidlist[] = {
> +static const struct pci_device_id pciidlist[] = {
>   	radeon_PCI_IDS
>   };
> -
>   MODULE_DEVICE_TABLE(pci, pciidlist);
>   
>   static const struct drm_driver kms_driver;