linux-kernel - Re: [PATCH 1/7] selftests: gpio: rework and simplify test implementation

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Date:   Sat, 2 Jan 2021 22:07:16 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "bamv2005@...il.com" <bamv2005@...il.com>
Subject: Re: [PATCH 1/7] selftests: gpio: rework and simplify test
 implementation

On Sat, Jan 02, 2021 at 03:52:32PM +0200, Andy Shevchenko wrote:
> On Saturday, January 2, 2021, Kent Gibson <warthog618@...il.com> wrote:
> 
> > The GPIO mockup selftests are overly complicated with separate
> > implementations of the tests for sysfs and cdev uAPI, and with the cdev
> > implementation being dependent on tools/gpio and libmount.
> >
> > Rework the test implementation to provide a common test suite with a
> > simplified pluggable uAPI interface.  The cdev implementation utilises
> > the GPIO uAPI directly to remove the dependence on tools/gpio.
> > The simplified uAPI interface removes the need for any file system mount
> > checks in C, and so removes the dependence on libmount.
> >
> > The rework also fixes the sysfs test implementation which has been broken
> > since the device created in the multiple gpiochip case was split into
> > separate devices.
> >
> >
> 
> I briefly looked at code in shell below... there are places to improve
> (useless use of: cat, test, negation, etc).
> 

My shell is clearly pretty poor, so I would really appreciate a pointer
to an example of each, and I'll then hunt down the rest.

Thanks,
Kent.