linux-kernel - Re: [PATCH 1/2] irq/irq_sim: provide irq_sim_fire

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Date:   Sun, 2 Dec 2018 23:20:27 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 1/2] irq/irq_sim: provide irq_sim_fire_edge()

niedz., 2 gru 2018 o 22:56 Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> napisał(a):
>
> Hello,
>
> On Thu, Nov 29, 2018 at 07:14:45PM +0100, Bartosz Golaszewski wrote:
> > We're getting too much into details of how to handle simulated
> > interrupts and we can continue discussing it, but meanwhile I'd like
> > to address a different thing:
> >
> > Thomas, Linus: after commit fa38869b0161 ("gpiolib: Don't support irq
> > sharing for userspace") some libgpiod tests are failing because we can
> > no longer depend on reading the value of a dummy GPIO after detecting
> > an interrupt to know the edge of the interrupt. While these interrupts
> > are triggered from debugfs and debugfs is not required to maintain
> > compatibility, I thing having a working test suite for the GPIO
> > subsystem and uAPI is worth applying these two patches and also the
> > previous one[1].
> >
> > Can we have them applied for 4.20 or are there any objections?
>
> Just for the record: I objected the patch, Bartosz agrees to discuss
> further and but because this is too much detail the patch should now be
> applied anyhow to fix the test suite of an external project. This seems
> wrong to me.
>

Just to look at it from a different perspective: we have a project
whose tests rely on a behavior that was changed by Uwe's patch. While
the patch is fine, we need to find a correct way of testing the GPIO
user API. This may take a long time. In order to not break the tests
of an external project in 4.20 I propose to patch the interrupt
simulator (a component only used for testing) for now and to revisit
it later without time pressure.

Best regards,
Bartosz