Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3;
MIME-Version: 1.0
References: <3281896.aeNJFYEL58@kreacher> <7617703.EvYhyI6sBW@kreacher> <ZWdF_XdUD6gxtYIW@smile.fi.intel.com>
In-Reply-To: <ZWdF_XdUD6gxtYIW@smile.fi.intel.com>
From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Wed, 29 Nov 2023 16:17:53 +0100
Message-ID: <CAJZ5v0heXGK0yjG-XL=YYKLhEroJpjvmy_yVFEPAF05h-O1LQQ@mail.gmail.com>
Subject: Re: [PATCH v1 3/4] ACPI: OSL: Allow Notify () handlers to run on all CPUs
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Linux ACPI <linux-acpi@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Michal Wilczynski <michal.wilczynski@intel.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Mario Limonciello <mario.limonciello@amd.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8BIT
Precedence: bulk

On Wed, Nov 29, 2023 at 3:34 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Wed, Nov 29, 2023 at 02:50:54PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.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.