linux-kernel - Re: [PATCH] memstick: Constify struct memstick_device

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Message-ID: <CAPDyKFpBK_aGqJh-k=mRYJoupJTULgGW7MueYzQXimLMAaUwTw@mail.gmail.com>
Date: Tue, 8 Oct 2024 16:35:50 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Maxim Levitsky <maximlevitsky@...il.com>, Alex Dubov <oakad@...oo.com>, 
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org, 
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH] memstick: Constify struct memstick_device_id

On Sat, 28 Sept 2024 at 18:21, Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> 'struct memstick_device_id' are not modified in these drivers.
>
> Constifying this structure moves some data to a read-only section, so
> increases overall security.
>
> Update memstick_dev_match(), memstick_bus_match() and struct
> memstick_driver accordingly.
>
> On a x86_64, with allmodconfig, as an example:
> Before:
> ======
>    text    data     bss     dec     hex filename
>   74055    3455      88   77598   12f1e drivers/memstick/core/ms_block.o
>
> After:
> =====
>    text    data     bss     dec     hex filename
>   74087    3423      88   77598   12f1e drivers/memstick/core/ms_block.o
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Applied for next, thanks!

Kind regards
Uffe


> ---
> Compile tested only
> ---
>  drivers/memstick/core/memstick.c    | 4 ++--
>  drivers/memstick/core/ms_block.c    | 2 +-
>  drivers/memstick/core/mspro_block.c | 2 +-
>  include/linux/memstick.h            | 2 +-
>  4 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
> index 9a3a784054cc..ae4e8b8e6eb7 100644
> --- a/drivers/memstick/core/memstick.c
> +++ b/drivers/memstick/core/memstick.c
> @@ -26,7 +26,7 @@ static DEFINE_IDR(memstick_host_idr);
>  static DEFINE_SPINLOCK(memstick_host_lock);
>
>  static int memstick_dev_match(struct memstick_dev *card,
> -                             struct memstick_device_id *id)
> +                             const struct memstick_device_id *id)
>  {
>         if (id->match_flags & MEMSTICK_MATCH_ALL) {
>                 if ((id->type == card->id.type)
> @@ -44,7 +44,7 @@ static int memstick_bus_match(struct device *dev, const struct device_driver *dr
>                                                  dev);
>         const struct memstick_driver *ms_drv = container_of_const(drv, struct memstick_driver,
>                                                                   driver);
> -       struct memstick_device_id *ids = ms_drv->id_table;
> +       const struct memstick_device_id *ids = ms_drv->id_table;
>
>         if (ids) {
>                 while (ids->match_flags) {
> diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
> index 47a314a4eb6f..c572f870fcf1 100644
> --- a/drivers/memstick/core/ms_block.c
> +++ b/drivers/memstick/core/ms_block.c
> @@ -2279,7 +2279,7 @@ static int msb_resume(struct memstick_dev *card)
>
>  #endif /* CONFIG_PM */
>
> -static struct memstick_device_id msb_id_tbl[] = {
> +static const struct memstick_device_id msb_id_tbl[] = {
>         {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
>          MEMSTICK_CLASS_FLASH},
>
> diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
> index 49accfdc89d6..13b317c56069 100644
> --- a/drivers/memstick/core/mspro_block.c
> +++ b/drivers/memstick/core/mspro_block.c
> @@ -1349,7 +1349,7 @@ static int mspro_block_resume(struct memstick_dev *card)
>
>  #endif /* CONFIG_PM */
>
> -static struct memstick_device_id mspro_block_id_tbl[] = {
> +static const struct memstick_device_id mspro_block_id_tbl[] = {
>         {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_PRO, MEMSTICK_CATEGORY_STORAGE_DUO,
>          MEMSTICK_CLASS_DUO},
>         {}
> diff --git a/include/linux/memstick.h b/include/linux/memstick.h
> index ebf73d4ee969..107bdcbedf79 100644
> --- a/include/linux/memstick.h
> +++ b/include/linux/memstick.h
> @@ -293,7 +293,7 @@ struct memstick_host {
>  };
>
>  struct memstick_driver {
> -       struct memstick_device_id *id_table;
> +       const struct memstick_device_id *id_table;
>         int                       (*probe)(struct memstick_dev *card);
>         void                      (*remove)(struct memstick_dev *card);
>         int                       (*suspend)(struct memstick_dev *card,
> --
> 2.46.2
>