linux-kernel - Re: [PATCH V5 3/3] hwmon: pwm-fan: Add RPM support via external interrupt

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Date:   Fri, 12 Apr 2019 06:47:21 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Kamil Debski <kamil@...as.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 3/3] hwmon: pwm-fan: Add RPM support via external
 interrupt

On 4/12/19 6:35 AM, Stefan Wahren wrote:
> Hi Enrico,
> 
> On 12.04.19 15:15, Enrico Weigelt, metux IT consult wrote:
>> On 11.04.19 15:30, Stefan Wahren wrote:
>>> This adds RPM support to the pwm-fan driver in order to use with
>>> fancontrol/pwmconfig. This feature is intended for fans with a tachometer
>>> output signal, which generate a defined number of pulses per revolution.
>> Wouldn't it be better to have a CONFIG_* flag for keeping the kernel
>> image size smaller when this feature isn't needed ?
> 
> i compared the kernel module size in linux-next for ARM without and with
> this patch:
> without patch: 12088 bytes
> with patch: 14292 bytes
> 
> I don't think it is worth the trouble.
> 

Agreed. This would end up being a mess, with lots of configuration options
in various drivers. Please don't start it.

Guenter