linux-kernel - Re: [PATCH] iio: humidity: hdc100x: constify attribute

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Date:   Sat, 1 Apr 2017 11:37:15 +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
Subject: Re: [PATCH] iio: humidity: hdc100x: constify attribute_group
 structures

On 01/04/17 09:23, simran singhal wrote:
> Check for attribute_group structures that are only stored in the
> attrs filed of iio_info structure. As the 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.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;
> 
> File size before:
>    text	   data	    bss	    dec	    hex	filename
>    3459	    488	      0	   3947	    f6b	drivers/iio/humidity/hdc100x.o
> 
> File size after:
>    text	   data	    bss	    dec	    hex	filename
>    3507	    424	      0	   3931	    f5b	drivers/iio/humidity/hdc100x.o
> 
> Signed-off-by: simran singhal <singhalsimran0@...il.com>
Applied.
> ---
>  drivers/iio/humidity/hdc100x.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/humidity/hdc100x.c b/drivers/iio/humidity/hdc100x.c
> index 265c34d..aa17115 100644
> --- a/drivers/iio/humidity/hdc100x.c
> +++ b/drivers/iio/humidity/hdc100x.c
> @@ -79,7 +79,7 @@ static struct attribute *hdc100x_attributes[] = {
>  	NULL
>  };
>  
> -static struct attribute_group hdc100x_attribute_group = {
> +static const struct attribute_group hdc100x_attribute_group = {
>  	.attrs = hdc100x_attributes,
>  };
>  
>