linux-kernel - Re: [PATCH] ata: Constify struct pci_device

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Message-ID: <ZzsoQlOaDP4FJ8G-@ryzen>
Date: Mon, 18 Nov 2024 12:42:58 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Damien Le Moal <dlemoal@...nel.org>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH] ata: Constify struct pci_device_id

On Fri, Nov 15, 2024 at 10:08:55PM +0100, Christophe JAILLET wrote:
> 'struct pci_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
>    4245	   1454	      4	   5703	   1647	drivers/ata/ata_generic.o
> 
> After:
> =====
>    text	   data	    bss	    dec	    hex	filename
>    4725	    974	      4	   5703	   1647	drivers/ata/ata_generic.o
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Compile tested-only.
> ---
> ---
>  drivers/ata/ata_generic.c  | 2 +-
>  drivers/ata/pata_atp867x.c | 2 +-
>  drivers/ata/pata_piccolo.c | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/ata/ata_generic.c b/drivers/ata/ata_generic.c
> index 2f57ec00ab82..e70b6c089cf1 100644
> --- a/drivers/ata/ata_generic.c
> +++ b/drivers/ata/ata_generic.c
> @@ -209,7 +209,7 @@ static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id
>  	return ata_pci_bmdma_init_one(dev, ppi, &generic_sht, (void *)id, 0);
>  }
>  
> -static struct pci_device_id ata_generic[] = {
> +static const struct pci_device_id ata_generic[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
> diff --git a/drivers/ata/pata_atp867x.c b/drivers/ata/pata_atp867x.c
> index aaef5924f636..308f86f9e2f0 100644
> --- a/drivers/ata/pata_atp867x.c
> +++ b/drivers/ata/pata_atp867x.c
> @@ -525,7 +525,7 @@ static int atp867x_reinit_one(struct pci_dev *pdev)
>  }
>  #endif
>  
> -static struct pci_device_id atp867x_pci_tbl[] = {
> +static const struct pci_device_id atp867x_pci_tbl[] = {
>  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867A),	0 },
>  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP867B),	0 },
>  	{ },
> diff --git a/drivers/ata/pata_piccolo.c b/drivers/ata/pata_piccolo.c
> index ced906bf56be..beb53bd990be 100644
> --- a/drivers/ata/pata_piccolo.c
> +++ b/drivers/ata/pata_piccolo.c
> @@ -97,7 +97,7 @@ static int ata_tosh_init_one(struct pci_dev *dev, const struct pci_device_id *id
>  	return ata_pci_bmdma_init_one(dev, ppi, &tosh_sht, NULL, 0);
>  }
>  
> -static struct pci_device_id ata_tosh[] = {
> +static const struct pci_device_id ata_tosh[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_3),  },
> -- 
> 2.47.0
> 

Looks good to me:
Reviewed-by: Niklas Cassel <cassel@...nel.org>

However, since we are in the middle of the merge window, expect to wait
until 6.13-rc1 is out until this is picked up.


Kind regards,
Niklas