2 files changed, 29 insertions, 27 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 19f6b9d27e83..9d3af380c6bd 100644
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -68,6 +68,7 @@ struct acpi_cpufreq_data {
         unsigned int max_freq;
         unsigned int resume;
         unsigned int cpu_feature;
+        u64 saved_aperf, saved_mperf;
 };
 
 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data);
@@ -241,26 +242,23 @@ static u32 get_cur_val(const struct cpumask *mask)
         return cmd.val;
 }
 
-struct perf_cur {
+struct perf_pair {
         union {
                 struct {
                         u32 lo;
                         u32 hi;
                 } split;
                 u64 whole;
-        } aperf_cur, mperf_cur;
+        } aperf, mperf;
 };
 
 
 static long read_measured_perf_ctrs(void *_cur)
 {
-        struct perf_cur *cur = _cur;
+        struct perf_pair *cur = _cur;
 
-        rdmsr(MSR_IA32_APERF, cur->aperf_cur.split.lo, cur->aperf_cur.split.hi);
-        rdmsr(MSR_IA32_MPERF, cur->mperf_cur.split.lo, cur->mperf_cur.split.hi);
-
-        wrmsr(MSR_IA32_APERF, 0, 0);
-        wrmsr(MSR_IA32_MPERF, 0, 0);
+        rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi);
+        rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi);
 
         return 0;
 }
@@ -281,52 +279,57 @@ static long read_measured_perf_ctrs(void *_cur)
 static unsigned int get_measured_perf(struct cpufreq_policy *policy,
                                       unsigned int cpu)
 {
-        struct perf_cur cur;
+        struct perf_pair readin, cur;
         unsigned int perf_percent;
         unsigned int retval;
 
-        if (!work_on_cpu(cpu, read_measured_perf_ctrs, &cur))
+        if (!work_on_cpu(cpu, read_measured_perf_ctrs, &readin))
                 return 0;
 
+        cur.aperf.whole = readin.aperf.whole -
+                                per_cpu(drv_data, cpu)->saved_aperf;
+        cur.mperf.whole = readin.mperf.whole -
+                                per_cpu(drv_data, cpu)->saved_mperf;
+        per_cpu(drv_data, cpu)->saved_aperf = readin.aperf.whole;
+        per_cpu(drv_data, cpu)->saved_mperf = readin.mperf.whole;
+
 #ifdef __i386__
         /*
          * We dont want to do 64 bit divide with 32 bit kernel
          * Get an approximate value. Return failure in case we cannot get
          * an approximate value.
          */
-        if (unlikely(cur.aperf_cur.split.hi || cur.mperf_cur.split.hi)) {
+        if (unlikely(cur.aperf.split.hi || cur.mperf.split.hi)) {
                 int shift_count;
                 u32 h;
 
-                h = max_t(u32, cur.aperf_cur.split.hi, cur.mperf_cur.split.hi);
+                h = max_t(u32, cur.aperf.split.hi, cur.mperf.split.hi);
                 shift_count = fls(h);
 
-                cur.aperf_cur.whole >>= shift_count;
-                cur.mperf_cur.whole >>= shift_count;
+                cur.aperf.whole >>= shift_count;
+                cur.mperf.whole >>= shift_count;
         }
 
-        if (((unsigned long)(-1) / 100) < cur.aperf_cur.split.lo) {
+        if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) {
                 int shift_count = 7;
-                cur.aperf_cur.split.lo >>= shift_count;
-                cur.mperf_cur.split.lo >>= shift_count;
+                cur.aperf.split.lo >>= shift_count;
+                cur.mperf.split.lo >>= shift_count;
         }
 
-        if (cur.aperf_cur.split.lo && cur.mperf_cur.split.lo)
-                perf_percent = (cur.aperf_cur.split.lo * 100) /
-                                cur.mperf_cur.split.lo;
+        if (cur.aperf.split.lo && cur.mperf.split.lo)
+                perf_percent = (cur.aperf.split.lo * 100) / cur.mperf.split.lo;
         else
                 perf_percent = 0;
 
 #else
-        if (unlikely(((unsigned long)(-1) / 100) < cur.aperf_cur.whole)) {
+        if (unlikely(((unsigned long)(-1) / 100) < cur.aperf.whole)) {
                 int shift_count = 7;
-                cur.aperf_cur.whole >>= shift_count;
-                cur.mperf_cur.whole >>= shift_count;
+                cur.aperf.whole >>= shift_count;
+                cur.mperf.whole >>= shift_count;
         }
 
-        if (cur.aperf_cur.whole && cur.mperf_cur.whole)
-                perf_percent = (cur.aperf_cur.whole * 100) /
-                                cur.mperf_cur.whole;
+        if (cur.aperf.whole && cur.mperf.whole)
+                perf_percent = (cur.aperf.whole * 100) / cur.mperf.whole;
         else
                 perf_percent = 0;
 
diff --git a/arch/x86/kernel/cpu/cpufreq/longhaul.c b/arch/x86/kernel/cpu/cpufreq/longhaul.c
index 0bd48e65a0ca..ce2ed3e4aad9 100644
--- a/arch/x86/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/x86/kernel/cpu/cpufreq/longhaul.c
@@ -33,7 +33,6 @@
 #include <linux/timex.h>
 #include <linux/io.h>
 #include <linux/acpi.h>
-#include <linux/kernel.h>
 
 #include <asm/msr.h>
 #include <acpi/processor.h>