linux-kernel - Re: [PATCH 4/8] platform/x86: intel_menlow: switch to use <linux/temperature.h> helpers

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Date:   Mon, 25 Nov 2019 23:34:50 +0900
From:   Akinobu Mita <akinobu.mita@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        linux-hwmon@...r.kernel.org, Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sujith Thomas <sujith.thomas@...el.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH 4/8] platform/x86: intel_menlow: switch to use
 <linux/temperature.h> helpers

2019年11月25日(月) 4:58 Andy Shevchenko <andy.shevchenko@...il.com>:
>
> On Sun, Nov 24, 2019 at 4:09 PM Akinobu Mita <akinobu.mita@...il.com> wrote:
> >
> > This switches the intel_menlow driver to use deci_kelvin_to_celsius() and
> > celsius_to_deci_kelvin() in <linux/temperature.h> instead of helpers in
> > <linux/thermal.h>.
> >
> > This is preparation for centralizing the kelvin to/from Celsius conversion
> > helpers in <linux/temprature.h>.
> >
> > Cc: Sujith Thomas <sujith.thomas@...el.com>
> > Cc: Darren Hart <dvhart@...radead.org>
> > Cc: Andy Shevchenko <andy@...radead.org>
> > Cc: Zhang Rui <rui.zhang@...el.com>
> > Cc: Eduardo Valentin <edubezval@...il.com>
> > Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> > Cc: Amit Kucheria <amit.kucheria@...durent.com>
> > Cc: Jean Delvare <jdelvare@...e.com>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: Keith Busch <kbusch@...nel.org>
> > Cc: Jens Axboe <axboe@...com>
> > Cc: Christoph Hellwig <hch@....de>
> > Cc: Sagi Grimberg <sagi@...mberg.me>
> > Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> > ---
> >  drivers/platform/x86/intel_menlow.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/platform/x86/intel_menlow.c b/drivers/platform/x86/intel_menlow.c
> > index b102f6d..6313591 100644
> > --- a/drivers/platform/x86/intel_menlow.c
> > +++ b/drivers/platform/x86/intel_menlow.c
> > @@ -302,8 +302,10 @@ static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
> >         int result;
> >
> >         result = sensor_get_auxtrip(attr->handle, idx, &value);
> > +       if (result)
> > +               return result;
> >
> > -       return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
> > +       return sprintf(buf, "%ld", deci_kelvin_to_celsius(value));
>
> Can you explain the change %lu to %ld?

Isn't it possible for aux values to be lower than 0 degrees Celsius?

> >  }
> >
> >  static ssize_t aux0_show(struct device *dev,
> > @@ -332,8 +334,8 @@ static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
> >         if (value < 0)
> >                 return -EINVAL;
> >
> > -       result = sensor_set_auxtrip(attr->handle, idx,
> > -                                   CELSIUS_TO_DECI_KELVIN(value));
>
> > +       result = sensor_set_auxtrip(attr->handle, idx,
> > +                                   celsius_to_deci_kelvin(value));
>
> How come the first line has been changed?

Because the trailing space is removed.  I'll mention it in the commit log.