linux-kernel - Re: [PATCH] pwm: constify pwm

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Date:   Wed, 18 Jan 2017 11:49:36 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     julia.lawall@...6.fr, linux@...sktech.co.nz,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pwm: constify pwm_ops structures

On Tue, Jan 10, 2017 at 11:42:06PM +0530, Bhumika Goyal wrote:
> Declare pwm_ops structures as const as they are only stored in the ops
> field of a pwm_chip structure. This field is of type const struct pwm_ops
> *, so pwm_ops structures having this property can be declared as const.
> Done using Coccinelle:
> 
> @r1 disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct pwm_ops i@......};
> 
> @ok1@
> identifier r1.i;
> position p;
> struct pxa_pwm_chip pwm;
> struct bfin_pwm_chip bwm;
> struct vt8500_chip vp;
> struct imx_chip icp;
> @@
> (
> pwm.chip.ops=&i@p
> |
> bwm.chip.ops=&i@p
> |
> vp.chip.ops=&i@p
> |
> icp.chip.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 pwm_ops i;
> 
> File size details:
> 
>    text	   data	    bss	    dec	    hex	filename
>    1646	    328	      0	   1974	    7b6	drivers/pwm/pwm-imx.o
>    1742	    224	      0	   1966	    7ae	drivers/pwm/pwm-imx.o
> 
>    1941	    296	      0	   2237	    8bd	drivers/pwm/pwm-pxa.o
>    2037	    192	      0	   2229	    8b5	drivers/pwm/pwm-pxa.o
> 
>    1946	    296	      0	   2242	    8c2	drivers/pwm/pwm-vt8500.o
>    2050	    192	      0	   2242	    8c2	drivers/pwm/pwm-vt8500.o
> 
> The drivers/pwm/pwm-bfin.o file did not compile.
> 
> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
> ---
> File: drivers/pwm/pwm-bfin.c is not tested
> 
>  drivers/pwm/pwm-bfin.c   | 2 +-
>  drivers/pwm/pwm-imx.c    | 2 +-
>  drivers/pwm/pwm-pxa.c    | 2 +-
>  drivers/pwm/pwm-vt8500.c | 2 +-
>  4 files changed, 4 insertions(+), 4 deletions(-)

Applied, thanks.

Thierry

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