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From:   Akinobu Mita <akinobu.mita@gmail.com>
Date:   Mon, 25 Nov 2019 23:29:56 +0900
Message-ID: <CAC5umyjzDODZf8ECWDmR6SAY-TNkdJ+a0GZRgOFcPCAMok2Ddg@mail.gmail.com>
Subject: Re: [PATCH 1/8] add header file for kelvin to/from Celsius conversion helpers
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Linux NVMe Mailinglist <linux-nvme@lists.infradead.org>,
        linux-hwmon@vger.kernel.org, Linux PM <linux-pm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Sujith Thomas <sujith.thomas@intel.com>,
        Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Eduardo Valentin <edubezval@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amit.kucheria@verdurent.com>,
        Jean Delvare <jdelvare@suse.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>
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2019=E5=B9=B411=E6=9C=8824=E6=97=A5(=E6=97=A5) 23:57 Andy Shevchenko <andy.=
shevchenko@gmail.com>:
>
> On Sun, Nov 24, 2019 at 4:09 PM Akinobu Mita <akinobu.mita@gmail.com> wro=
te:
> >
> > There are several helper macros to convert kelvin to/from Celsius in
> > <linux/thermal.h> for thermal drivers.  These are useful for any other
> > drivers or subsystems, but it's odd to include <linux/thermal.h> just f=
or
> > the helpers.
> >
> > This adds a new <linux/temperature.h> that provides the equivalent inli=
ne
> > functions for any drivers or subsystems.  It is intended to replace the
> > helpers in <linux/thermal.h>.
> >
> > Cc: Sujith Thomas <sujith.thomas@intel.com>
> > Cc: Darren Hart <dvhart@infradead.org>
> > Cc: Andy Shevchenko <andy@infradead.org>
> > Cc: Zhang Rui <rui.zhang@intel.com>
> > Cc: Eduardo Valentin <edubezval@gmail.com>
> > Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> > Cc: Amit Kucheria <amit.kucheria@verdurent.com>
> > Cc: Jean Delvare <jdelvare@suse.com>
> > Cc: Guenter Roeck <linux@roeck-us.net>
> > Cc: Keith Busch <kbusch@kernel.org>
> > Cc: Jens Axboe <axboe@fb.com>
> > Cc: Christoph Hellwig <hch@lst.de>
> > Cc: Sagi Grimberg <sagi@grimberg.me>
> > Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> > ---
> >  include/linux/temperature.h | 39 +++++++++++++++++++++++++++++++++++++=
++
>
> >  include/linux/thermal.h     |  1 +
>
>
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -14,6 +14,7 @@
> >  #include <linux/idr.h>
> >  #include <linux/device.h>
> >  #include <linux/sysfs.h>
> > +#include <linux/temperature.h>
> >  #include <linux/workqueue.h>
> >  #include <uapi/linux/thermal.h>
>
> I don't see any users of it. Why did you include?

The rest of this patch series starts using it.

I decided to include <linux/temperature.h> from <linux/thermal.h> because
the existing <linux/thermal.h> provides the conversion helpers.

However, not all of the thermal drivers require these conversion helpers,
so we can change to include <linux/temperature.h> from each thermal driver
instead of including it from <linux/thermal.h>.

Which way do you prefer?