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

[Kent Gibson]

On Sat, Jan 02, 2021 at 03:52:32PM +0200, Andy Shevchenko wrote:
> On Saturday, January 2, 2021, Kent Gibson <warthog618@xxxxxxxxx> 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.