[CPUFREQ] powernow-k8: Always compile powernow-k8 driver with ACPI support

powernow-k8 driver should always try to get cpufreq info from ACPI.
Otherwise it will not be able to detect the transition latency correctly
which results in ondemand governor taking a wrong sampling rate which will
then result in sever performance loss.

Let the user not shoot himself in the foot and always compile in ACPI
support for powernow-k8.

This also fixes a wrong message if ACPI_PROCESSOR is compiled as a module and
#ifndef CONFIG_ACPI_PROCESSOR
path is chosen.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>

arch/x86/kernel/cpu/cpufreq/Kconfig

@@ -87,30 +87,15 @@ config X86_POWERNOW_K7_ACPI
 config X86_POWERNOW_K8
 	tristate "AMD Opteron/Athlon64 PowerNow!"
 	select CPU_FREQ_TABLE
+	depends on ACPI && ACPI_PROCESSOR
 	help
-	  This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
+	  This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called powernow-k8.
 
 	  For details, take a look at <file:Documentation/cpu-freq/>.
 
-	  If in doubt, say N.
-
-config X86_POWERNOW_K8_ACPI
-	bool
-	prompt "ACPI Support" if X86_32
-	depends on ACPI && X86_POWERNOW_K8 && ACPI_PROCESSOR
-	depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
-	default y
-	help
-	  This provides access to the K8s Processor Performance States via ACPI.
-	  This driver is probably required for CPUFreq to work with multi-socket and
-	  SMP systems.  It is not required on at least some single-socket yet
-	  multi-core systems, even if SMP is enabled.
-
-	  It is safe to say Y here.
-
 config X86_GX_SUSPMOD
 	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 	depends on X86_32 && PCI

arch/x86/kernel/cpu/cpufreq/powernow-k8.c

@@ -38,11 +38,9 @@
 
 #include <asm/msr.h>
 
-#ifdef CONFIG_X86_POWERNOW_K8_ACPI
 #include <linux/acpi.h>
 #include <linux/mutex.h>
 #include <acpi/processor.h>
-#endif
 
 #define PFX "powernow-k8: "
 #define VERSION "version 2.20.00"
@@ -800,7 +798,6 @@ static int find_psb_table(struct powernow_k8_data *data)
 	return -ENODEV;
 }
 
-#ifdef CONFIG_X86_POWERNOW_K8_ACPI
 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
 		unsigned int index)
 {
@@ -1030,23 +1027,6 @@ static int get_transition_latency(struct powernow_k8_data *data)
 	return 1000 * max_latency;
 }
 
-#else
-static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
-{
-	return -ENODEV;
-}
-static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
-{
-	return;
-}
-static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
-		unsigned int index)
-{
-	return;
-}
-static int get_transition_latency(struct powernow_k8_data *data) { return 0; }
-#endif /* CONFIG_X86_POWERNOW_K8_ACPI */
-
 /* Take a frequency, and issue the fid/vid transition command */
 static int transition_frequency_fidvid(struct powernow_k8_data *data,
 		unsigned int index)
@@ -1260,19 +1240,11 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
 		 * an UP version, and is deprecated by AMD.
 		 */
 		if (num_online_cpus() != 1) {
-#ifndef CONFIG_ACPI_PROCESSOR
-			printk(KERN_ERR PFX
-				"ACPI Processor support is required for "
-				"SMP systems but is absent. Please load the "
-				"ACPI Processor module before starting this "
-				"driver.\n");
-#else
 			printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
 			       " ACPI _PSS objects in a way that Linux "
 			       "understands. Please report this to the Linux "
 			       "ACPI maintainers and complain to your BIOS "
 			       "vendor.\n");
-#endif
 			kfree(data);
 			return -ENODEV;
 		}

arch/x86/kernel/cpu/cpufreq/powernow-k8.h

@@ -45,11 +45,10 @@ struct powernow_k8_data {
 	 * frequency is in kHz */
 	struct cpufreq_frequency_table  *powernow_table;
 
-#ifdef CONFIG_X86_POWERNOW_K8_ACPI
 	/* the acpi table needs to be kept. it's only available if ACPI was
 	 * used to determine valid frequency/vid/fid states */
 	struct acpi_processor_performance acpi_data;
-#endif
+
 	/* we need to keep track of associated cores, but let cpufreq
 	 * handle hotplug events - so just point at cpufreq pol->cpus
 	 * structure */
@@ -222,10 +221,8 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
 
 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
 
-#ifdef CONFIG_X86_POWERNOW_K8_ACPI
 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
-#endif
 
 #ifdef CONFIG_SMP
 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])