linux-kernel - Re: [PATCH v2 05/10] pwm: ntxec: Add driver for PWM function in Netronix EC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200908093538.GM4400@dell>
Date:   Tue, 8 Sep 2020 10:35:38 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Josua Mayer <josua.mayer@....eu>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>, Daniel Palmer <daniel@...f.com>
Subject: Re: [PATCH v2 05/10] pwm: ntxec: Add driver for PWM function in
 Netronix EC

On Tue, 08 Sep 2020, Andy Shevchenko wrote:

> On Tue, Sep 8, 2020 at 11:14 AM Lee Jones <lee.jones@...aro.org> wrote:
> > On Sat, 05 Sep 2020, Andy Shevchenko wrote:
> > > On Saturday, September 5, 2020, Jonathan Neuschäfer <j.neuschaefer@....net>
> > > wrote:
> 
> ...
> 
> > > > +config PWM_NTXEC
> > > > +       tristate "Netronix embedded controller PWM support"
> > >
> > >
> > >
> > >
> > > > +       depends on MFD_NTXEC && OF
> > >
> > >
> > > I don’t see need to reduce test coverage and use of the driver by sticking
> > > with OF. Actually it’s not used.
> >
> > If the device is only known to boot with OF, then it's pointless
> > building it when !OF.
> 
> No, it's not. As I pointed out the (compilation) test coverage is better.

No, it's a waste of disk space.

Why would you knowingly compile something you know you can't use?

That's the whole point of COMPILE_TEST.

Note that when you want real coverage and you use `allyesconfig`
and/or `allmodconfig` then CONFIG_OF is also enabled on platforms
which support it.

> > If you want to increase test coverage enable
> > COMPILE_TEST instead.
> 
> It is one way to achieve that, yes;
> 
>        depends on OF || COMPILE_TEST
>        depends on MFD_NTXEC

This is better.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog