linux-kernel - Re: [PATCH v2] iio: light: lm3533-als: constify attribute

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Date:   Sun, 2 Apr 2017 09:09:16 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     simran singhal <singhalsimran0@...il.com>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: Re: [PATCH v2] iio: light: lm3533-als: constify attribute_group
 structures

On 30/03/17 19:40, simran singhal wrote:
> Check for attribute_group structures that are only stored in the
> event_attrs filed of iio_info structure. As the event_attrs field of
> iio_info structures is constant, so these attribute_group structures can
> also be declared constant. Done using coccinelle:
> 
> @r1 disable optional_qualifier @
> identifier i;
> position p;
> @@
> static struct attribute_group i@p = {...};
> 
> @ok1@
> identifier r1.i;
> position p;
> struct iio_info x;
> @@
> x.event_attrs=&i@p;
> 
> @bad@
> position p!={r1.p,ok1.p};
> identifier r1.i;
> @@
> i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> static
> +const
> struct attribute_group i={...};
> 
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> +const
> struct attribute_group i;
> 
> As the attrs field of iio_info structures is also constant, so these
> attribute_group structures can also be declared constant. Done manually.
> 
> File size before:
>    text    data     bss     dec     hex filename
>    5798    2376       0    8174    1fee drivers/iio/light/lm3533-als.o
> 
> File size after:
>    text	   data	    bss	    dec	    hex	filename
>    5926	   2248	      0	   8174	   1fee	drivers/iio/light/lm3533-als.o
> 
> Signed-off-by: simran singhal <singhalsimran0@...il.com>
Applied.
> ---
>  v2:
>    -make one more attribute_group const.
>    -change the values of file size after.
>    -change commit message.
> 
>  drivers/iio/light/lm3533-als.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/light/lm3533-als.c b/drivers/iio/light/lm3533-als.c
> index f409c20..0443fd2 100644
> --- a/drivers/iio/light/lm3533-als.c
> +++ b/drivers/iio/light/lm3533-als.c
> @@ -690,7 +690,7 @@ static struct attribute *lm3533_als_event_attributes[] = {
>  	NULL
>  };
>  
> -static struct attribute_group lm3533_als_event_attribute_group = {
> +static const struct attribute_group lm3533_als_event_attribute_group = {
>  	.attrs = lm3533_als_event_attributes
>  };
>  
> @@ -714,7 +714,7 @@ static struct attribute *lm3533_als_attributes[] = {
>  	NULL
>  };
>  
> -static struct attribute_group lm3533_als_attribute_group = {
> +static const struct attribute_group lm3533_als_attribute_group = {
>  	.attrs = lm3533_als_attributes
>  };
>  
>