[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>

3 files changed, 3 insertions, 49 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/Kconfig b/arch/x86/kernel/cpu/cpufreq/Kconfig
index 65792c2cc462..52c839875478 100644
--- a/arch/x86/kernel/cpu/cpufreq/Kconfig
+++ b/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
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 4dd7e3bdee23..acc06b03194e 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/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;
                 }
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
index 8ecc75b6c7c3..6c6698feade1 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
+++ b/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[])