linux-kernel - Re: [patch v12 13/13] task isolation: only TIF_TASK

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Date:   Wed, 27 Apr 2022 09:45:54 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marcelo Tosatti <mtosatti@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Nitesh Lal <nilal@...hat.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alex Belits <abelits@...its.com>, Peter Xu <peterx@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Oscar Shiang <oscar0225@...email.tw>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch v12 13/13] task isolation: only TIF_TASK_ISOL if task
 isolation is enabled

On Tue, Mar 15 2022 at 12:31, Marcelo Tosatti wrote:

$Subject does not qualify as a parseable sentence.

> This avoids processing of TIF_TASK_ISOL, when returning to userspace,
> for tasks which do not have task isolation configured.

That's how kernel development works, right:

   1) Add half baken stuff
   2) Apply duct tape on top

You know exactly, that this is _not_ the way it works.

This whole thing is half thought out tinkerware with [ill|un]defined
semantics.

Thanks,

        tglx