linux-kernel - Re: [PATCH] rtc: rtc-vr41xx: remove unused function

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Date:	Tue, 1 Mar 2016 15:55:58 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com
Subject: Re: [PATCH] rtc: rtc-vr41xx: remove unused function

On Tue, Mar 01, 2016 at 06:26:21PM +0530, Sudip Mukherjee wrote:
> We were getting build warning about:
> drivers/rtc/rtc-vr41xx.c:228:12: warning: ‘vr41xx_rtc_alarm_irq_enable’
> defined but not used
> 
> The function vr41xx_rtc_alarm_irq_enable() was not used anywhere.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
> ---
> 
> build log is at:
> https://travis-ci.org/sudipm-mukherjee/parport/jobs/112780206
> 
>  drivers/rtc/rtc-vr41xx.c | 18 ------------------
>  1 file changed, 18 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
> index f64c282..68cb63e 100644
> --- a/drivers/rtc/rtc-vr41xx.c
> +++ b/drivers/rtc/rtc-vr41xx.c
> @@ -225,24 +225,6 @@ static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long
>  	return 0;
>  }
>  
> -static int vr41xx_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
> -{
> -	spin_lock_irq(&rtc_lock);
> -	if (enabled) {
> -		if (!alarm_enabled) {
> -			enable_irq(aie_irq);
> -			alarm_enabled = 1;
> -		}
> -	} else {
> -		if (alarm_enabled) {
> -			disable_irq(aie_irq);
> -			alarm_enabled = 0;
> -		}
> -	}
> -	spin_unlock_irq(&rtc_lock);
> -	return 0;
> -}
> -

I don't think it's supposed to be unused, rather back at the time it
simply wasn't hooked up to the rtc_class_ops.

Here's what I used.

Thierry

--- >8 ---
From 91c39e61b10551f8fbdb55cadbc29a104071bea2 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@...dia.com>
Date: Tue, 1 Mar 2016 15:50:25 +0100
Subject: [PATCH] rtc: vr41xx: Hook up ->alarm_irq_enable()

The vr41xx_rtc_alarm_irq_enable() function was extracted in commit
16380c153a69 ("RTC: Convert rtc drivers to use the alarm_irq_enable
method") from a more generic IOCTL handler. However the function was
never hooked up to the struct rtc_class_ops to which a new callback
had earlier been added for this purpose in commit 099e657625e8 ("rtc:
add alarm/update irq interfaces").

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/rtc/rtc-vr41xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
index f64c282275b3..898fdd03668d 100644
--- a/drivers/rtc/rtc-vr41xx.c
+++ b/drivers/rtc/rtc-vr41xx.c
@@ -278,6 +278,7 @@ static const struct rtc_class_ops vr41xx_rtc_ops = {
 	.set_time	= vr41xx_rtc_set_time,
 	.read_alarm	= vr41xx_rtc_read_alarm,
 	.set_alarm	= vr41xx_rtc_set_alarm,
+	.alarm_irq_enable = vr41xx_rtc_alarm_irq_enable,
 };
 
 static int rtc_probe(struct platform_device *pdev)
-- 
2.7.1

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