[PATCH v2] sony-laptop: constify spic_attribute_group and sony_laptop_input_index.

[PATCH v2] sony-laptop: constify spic_attribute_group and sony_laptop_input_index.

[Arvind Yadav]

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work with const
attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  31273	   5176	    372	  36821	   8fd5	drivers/platform/x86/sony-laptop.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  31337	   5112	    372	  36821	   8fd5	drivers/platform/x86/sony-laptop.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
Changes in v2:
              Resolve warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-array-qualifiers]
  key_dev->keycode = &sony_laptop_input_keycode_map;

 drivers/platform/x86/sony-laptop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index aa2ee51..bfae795 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -222,7 +222,7 @@ struct sony_laptop_keypress {
 /* Correspondance table between sonypi events
  * and input layer indexes in the keymap
  */
-static int sony_laptop_input_index[] = {
+static const int sony_laptop_input_index[] = {
 	-1,	/*  0 no event */
 	-1,	/*  1 SONYPI_EVENT_JOGDIAL_DOWN */
 	-1,	/*  2 SONYPI_EVENT_JOGDIAL_UP */
@@ -4032,7 +4032,7 @@ struct device_attribute spic_attr_##_name = __ATTR(_name,	\
 	NULL
 };
 
-static struct attribute_group spic_attribute_group = {
+static const struct attribute_group spic_attribute_group = {
 	.attrs = spic_attributes
 };
 
-- 
1.9.1

Re: [PATCH v2] sony-laptop: constify spic_attribute_group and sony_laptop_input_index.

[Andy Shevchenko]

On Fri, Jun 30, 2017 at 8:09 AM, Arvind Yadav <arvind.yadav.cs@gmail.com> wrote:
> attribute_groups are not supposed to change at runtime. All functions
> working with attribute_groups provided by <linux/sysfs.h> work with const
> attribute_group. So mark the non-const structs as const.
>
> File size before:
>    text    data     bss     dec     hex filename
>   31273    5176     372   36821    8fd5 drivers/platform/x86/sony-laptop.o
>
> File size After adding 'const':
>    text    data     bss     dec     hex filename
>   31337    5112     372   36821    8fd5 drivers/platform/x86/sony-laptop.o
>

A bit late, Arnd's patch has been applied. Please, test it beforehand next time.
Thanks.

> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
> ---
> Changes in v2:
>               Resolve warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-array-qualifiers]
>   key_dev->keycode = &sony_laptop_input_keycode_map;
>
>  drivers/platform/x86/sony-laptop.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
> index aa2ee51..bfae795 100644
> --- a/drivers/platform/x86/sony-laptop.c
> +++ b/drivers/platform/x86/sony-laptop.c
> @@ -222,7 +222,7 @@ struct sony_laptop_keypress {
>  /* Correspondance table between sonypi events
>   * and input layer indexes in the keymap
>   */
> -static int sony_laptop_input_index[] = {
> +static const int sony_laptop_input_index[] = {
>         -1,     /*  0 no event */
>         -1,     /*  1 SONYPI_EVENT_JOGDIAL_DOWN */
>         -1,     /*  2 SONYPI_EVENT_JOGDIAL_UP */
> @@ -4032,7 +4032,7 @@ struct device_attribute spic_attr_##_name = __ATTR(_name, \
>         NULL
>  };
>
> -static struct attribute_group spic_attribute_group = {
> +static const struct attribute_group spic_attribute_group = {
>         .attrs = spic_attributes
>  };
>
> --
> 1.9.1
>



-- 
With Best Regards,
Andy Shevchenko