linux-kernel - Re: [PATCH v1 2/2] gpio: tegra: Use raw

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Message-ID: <CAHp75VeJrQCxaCR+6u79=k=EP7y=LpEsytp6MWQ+UGz+oFXP6A@mail.gmail.com>
Date:   Wed, 4 Nov 2020 16:47:38 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Peter Geis <pgwipeout@...il.com>, linux-tegra@...r.kernel.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] gpio: tegra: Use raw_spinlock

On Wed, Nov 4, 2020 at 3:27 PM Dmitry Osipenko <digetx@...il.com> wrote:
>
> Use raw_spinlock in order to fix spurious messages about invalid context
> when spinlock debugging is enabled. This happens because there is a legit
> nested raw_spinlock->spinlock locking which debug code can't recognize and
> handle.

This sounds like papering over a problem that exists somewhere else.

What I would rather make as a selling point is that raw spin locks are
necessary to be in the RT kernel for IRQ chips.

> Tested-by: Peter Geis <pgwipeout@...il.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

-- 
With Best Regards,
Andy Shevchenko