linux-kernel - Re: [PATCH] rtc: zynqmp: One function call less in xlnx_rtc_alarm_irq

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Message-ID: <20190705223617.GC12409@piout.net>
Date:   Sat, 6 Jul 2019 00:36:17 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Michal Simek <michal.simek@...inx.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] rtc: zynqmp: One function call less in
 xlnx_rtc_alarm_irq_enable()

On 05/07/2019 22:45:39+0200, Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 5 Jul 2019 22:37:58 +0200
> 
> Avoid an extra function call by using a ternary operator instead of
> a conditional statement for a setting selection.
> 

Please elaborate on why this is a good thing.

> This issue was detected by using the Coccinelle software.
> 

Unless you use an upstream coccinelle script or you share the one you
are using, this is not a useful information.

> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/rtc/rtc-zynqmp.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
> index 00639594de0c..4631019a54e2 100644
> --- a/drivers/rtc/rtc-zynqmp.c
> +++ b/drivers/rtc/rtc-zynqmp.c
> @@ -124,11 +124,8 @@ static int xlnx_rtc_alarm_irq_enable(struct device *dev, u32 enabled)
>  {
>  	struct xlnx_rtc_dev *xrtcdev = dev_get_drvdata(dev);
> 
> -	if (enabled)
> -		writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_EN);
> -	else
> -		writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_DIS);
> -
> +	writel(RTC_INT_ALRM,
> +	       xrtcdev->reg_base + (enabled ? RTC_INT_EN : RTC_INT_DIS));

This makes the code less readable.

>  	return 0;
>  }
> 
> --
> 2.22.0
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com