linux-kernel - Re: [PATCH 1/2] spi: dt-bindings: introduce linux,use-rt-queue flag

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Message-ID: <CACRpkdb66Br+nVPiih+oQQfXokMRYXUSE4rriPykR-yA9eDAxg@mail.gmail.com>
Date:   Fri, 9 Jun 2023 11:22:16 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...tq-group.com
Subject: Re: [PATCH 1/2] spi: dt-bindings: introduce linux,use-rt-queue flag

On Fri, Jun 9, 2023 at 11:13 AM Alexander Stein
<alexander.stein@...tq-group.com> wrote:

> > I fully sympathize with this problem, because I have faced
> > similar problems myself.
>
> You mean RT-scheduling before userspace is up? Can you elaborate the issues
> you see?

No. But choosing block layer scheduler (BFQ for MMC cards) before userspace
is up, which is currently done by udev scripts in eg Fedora :(

Yours,
Linus Walleij