linux-kernel - [PATCH 3/8] cpufreq: Add compatibility hack to powernow-k8

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Message-ID: <1343305724-2809-4-git-send-email-andre.przywara@amd.com>
Date:	Thu, 26 Jul 2012 14:28:39 +0200
From:	Andre Przywara <andre.przywara@....com>
To:	<cpufreq@...r.kernel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
CC:	Matthew Garrett <mjg@...hat.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Thomas Renninger <trenn@...e.de>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Andre Przywara <andre.przywara@....com>
Subject: [PATCH 3/8] cpufreq: Add compatibility hack to powernow-k8

From: Matthew Garrett <mjg@...hat.com>

cpufreq modules are often loaded from init scripts that assume that all
recent AMD systems will use powernow-k8, so we should ensure that loading
it triggers a load of acpi-cpufreq if the latter is built as a module.
This avoids the problem of users ending up without any cpufreq support
after the transition.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 drivers/cpufreq/powernow-k8.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index c0e8164..6e35ed2 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1567,8 +1567,12 @@ static int __cpuinit powernowk8_init(void)
 			supported_cpus++;
 	}
 
-	if (supported_cpus != num_online_cpus())
+	if (supported_cpus != num_online_cpus()) {
+		if (static_cpu_has(X86_FEATURE_HW_PSTATE))
+			request_module("acpi_cpufreq");
+
 		return -ENODEV;
+	}
 
 	printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
 		num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
-- 
1.7.4.4


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