linux-kernel - Re: [PATCH v1 3/4] ACPI: OSL: Allow Notify () handlers to run on all CPUs

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Message-ID: <CAJZ5v0heXGK0yjG-XL=YYKLhEroJpjvmy_yVFEPAF05h-O1LQQ@mail.gmail.com>
Date:   Wed, 29 Nov 2023 16:17:53 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v1 3/4] ACPI: OSL: Allow Notify () handlers to run on all CPUs

On Wed, Nov 29, 2023 at 3:34 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Wed, Nov 29, 2023 at 02:50:54PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > Notify () handlers, like GPE handlers, are only allowed to run on CPU0
> > now out of the concern that they might trigger an SMM trap and that (in
> > some cases) the SMM code running as a result of that might corrupt
> > memory if not run on CPU0.
>
> Pardon my French, but I'm a bit lost in the semantics of all those "that".

Well, fair enough.

> Maybe the above can be simplified?

It can be rephrased.