linux-kernel - [ 39/46] cpufreq: Add module aliases for acpi-cpufreq

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Date:	Thu, 24 Jan 2013 13:13:17 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Leonid Isaev <lisaev@...il.iu.edu>,
	Borislav Petkov <bp@...e.de>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [ 39/46] cpufreq: Add module aliases for acpi-cpufreq

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matthew Garrett <matthew.garrett@...ula.com>

commit efa17194581bdfca0986dabc178908bd7c21ba00 upstream.

The acpi core will call request_module("acpi-cpufreq") on subsystem init,
but this will fail if the module isn't available at that stage of boot.
Add some module aliases to ensure that udev can load the module on Intel
and AMD systems with the appropriate feature bits - I /think/ that this
will also work on VIA systems, but haven't verified that.

References: http://lkml.kernel.org/r/1448223.sdUJnNSRz4@vostro.rjw.lan
Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
Tested-by: Leonid Isaev <lisaev@...il.iu.edu>
Acked-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpufreq/acpi-cpufreq.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -1030,4 +1030,11 @@ MODULE_PARM_DESC(acpi_pstate_strict,
 late_initcall(acpi_cpufreq_init);
 module_exit(acpi_cpufreq_exit);

+static const struct x86_cpu_id acpi_cpufreq_ids[] = {
+	X86_FEATURE_MATCH(X86_FEATURE_ACPI),
+	X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
+
 MODULE_ALIAS("acpi");

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