linux-kernel - Re: [PATCH 4/4] thermal: bcm2835: constify thermal_zone_of_device

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Date:   Mon, 7 Aug 2017 08:41:22 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     bhumirks@...il.com, kernel-janitors@...r.kernel.org,
        Eduardo Valentin <edubezval@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>, linux-pm@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] thermal: bcm2835: constify thermal_zone_of_device_ops
 structures

Am 05.08.2017 um 22:37 schrieb Julia Lawall:
> The thermal_zone_of_device_ops structure is only passed as the fourth
> argument to thermal_zone_of_sensor_register, which is declared as const.
> Thus the thermal_zone_of_device_ops structure itself can be const.
>
> Done with the help of Coccinelle.
>
> // <smpl>
> @r disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct thermal_zone_of_device_ops i@p = { ... };
>
> @ok1@
> identifier r.i;
> expression e1,e2,e3;
> position p;
> @@
> thermal_zone_of_sensor_register(e1,e2,e3,&i@p)
>
> @bad@
> position p != {r.p,ok1.p};
> identifier r.i;
> struct thermal_zone_of_device_ops e;
> @@
> e@i@p
>
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> static
> +const
>  struct thermal_zone_of_device_ops i = { ... };
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Acked-by: Stefan Wahren <stefan.wahren@...e.com>

>
> ---
>  drivers/thermal/broadcom/bcm2835_thermal.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/broadcom/bcm2835_thermal.c b/drivers/thermal/broadcom/bcm2835_thermal.c
> index e6863c8..a4d6a0e 100644
> --- a/drivers/thermal/broadcom/bcm2835_thermal.c
> +++ b/drivers/thermal/broadcom/bcm2835_thermal.c
> @@ -145,7 +145,7 @@ static void bcm2835_thermal_debugfs(struct platform_device *pdev)
>  	debugfs_create_regset32("regset", 0444, data->debugfsdir, regset);
>  }
>  
> -static struct thermal_zone_of_device_ops bcm2835_thermal_ops = {
> +static const struct thermal_zone_of_device_ops bcm2835_thermal_ops = {
>  	.get_temp = bcm2835_thermal_get_temp,
>  };
>  
>