linux-kernel - Re: [PATCH v1 0/3] ACPI: OSL/EC: Use spin locks without disabling interrupts

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Message-ID: <CAJZ5v0i=SOyxRF4vV-WZJ-dRD8PZiyFLC7h+trtuhQ_eKLF0jw@mail.gmail.com>
Date: Thu, 28 Dec 2023 14:18:52 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: 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>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Mario Limonciello <mario.limonciello@....com>, Daniel Drake <drake@...lessm.com>
Subject: Re: [PATCH v1 0/3] ACPI: OSL/EC: Use spin locks without disabling interrupts

On Fri, Dec 15, 2023 at 12:34 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> Hi Everyone,
>
> After
>
> https://patchwork.kernel.org/project/linux-acpi/patch/5745568.DvuYhMxLoT@kreacher/
>
> the SCI interrupt handler is threaded, so ACPICA spin locks can be used without
> disabling interrupts, because they cannot be acquired from a hardirq handler
> running on the same CPU as any code already holding the spin lock.  This patch
> [1/3] removes disabling interrupts from acpi_os_acquire_lock() and updates
> acpi_os_release_lock() accordingly.
>
> Patch [2/2] uses the observation that if acpi_handle_interrupt() can run
> in a threaded interrupt handler in the GPE case, it can also run in a threaded
> interrupt handler in the dedicated IRQ case, so it makes the EC driver use a
> threaded handler for the dedicated EC interrupt.
>
> Patch [3/3], in analogy with patch [1/3], uses the observation that after patch
> [2/2] all of the EC code runs in thread context, so it need not disable
> interrupts on the local CPU before acquiring a spin lock, so the EC driver is
> updated to operate its spin lock without disabling interrupts.

I don't see any objections to these patches, so queuing them up for 6.8.

Thanks!