linux-kernel - Re: [PATCH] soc: dove: constify reset_control

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Date:   Fri, 13 Jan 2017 17:36:42 +0100
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:     Bhumika Goyal <bhumirks@...il.com>, julia.lawall@...6.fr,
        rmk+kernel@....linux.org.uk, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: dove: constify reset_control_ops structures

Hi Sebastian,
 
 On lun., janv. 09 2017, Bhumika Goyal <bhumirks@...il.com> wrote:

> Declare reset_control_ops as const as they are only stored in the ops
> field of a reset_controller_dev structure. This field is of type const
> struct reset_control_ops *, so reset_control_ops structures having this
> property can be declared as const.
> Done using Coccinelle:
>
> @r1 disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct reset_control_ops i@......};
>
> @ok1@
> identifier r1.i;
> position p;
> struct reset_controller_dev x;
> @@
> x.ops=&i@p;
>
> @bad@
> position p!={r1.p,ok1.p};
> identifier r1.i;
> @@
> i@p
>
> @depends on !bad disable optional_qualifier@
> identifier r1.i;
> @@
> +const
> struct reset_control_ops i;
>
> File size before: drivers/soc/dove/pmu.o
>    text	   data	    bss	    dec	    hex	filename
>    2447	    112	     16	   2575	    a0f	drivers/soc/dove/pmu.o
>
> File size after: drivers/soc/dove/pmu.o
>    text	   data	    bss	    dec	    hex	filename
>    2479	     80	     16	   2575	    a0f	drivers/soc/dove/pmu.o
>

If you agree with this patch I will apply it on mvebu/soc.

Thanks,

Gregory

> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
> ---
>  drivers/soc/dove/pmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/soc/dove/pmu.c b/drivers/soc/dove/pmu.c
> index 039374e..95d77ec 100644
> --- a/drivers/soc/dove/pmu.c
> +++ b/drivers/soc/dove/pmu.c
> @@ -87,7 +87,7 @@ static int pmu_reset_deassert(struct reset_controller_dev *rc, unsigned long id)
>  	return 0;
>  }
>  
> -static struct reset_control_ops pmu_reset_ops = {
> +static const struct reset_control_ops pmu_reset_ops = {
>  	.reset = pmu_reset_reset,
>  	.assert = pmu_reset_assert,
>  	.deassert = pmu_reset_deassert,
> -- 
> 1.9.1
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com