x86, Intel: Convert to the new bit access MSR accessors

... and save some lines of code.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1394384725-10796-4-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2 files changed, 13 insertions, 26 deletions

diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index c19fc60ff062..045e6db6f58a 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -368,14 +368,16 @@
 #define THERM_LOG_THRESHOLD1           (1 << 9)
 
 /* MISC_ENABLE bits: architectural */
-#define MSR_IA32_MISC_ENABLE_FAST_STRING        (1ULL << 0)
+#define MSR_BIT_FAST_STRING                             0
+#define MSR_IA32_MISC_ENABLE_FAST_STRING        (1ULL << MSR_BIT_FAST_STRING)
 #define MSR_IA32_MISC_ENABLE_TCC                (1ULL << 1)
 #define MSR_IA32_MISC_ENABLE_EMON               (1ULL << 7)
 #define MSR_IA32_MISC_ENABLE_BTS_UNAVAIL        (1ULL << 11)
 #define MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL       (1ULL << 12)
 #define MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP (1ULL << 16)
 #define MSR_IA32_MISC_ENABLE_MWAIT              (1ULL << 18)
-#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID        (1ULL << 22)
+#define MSR_BIT_LIMIT_CPUID                             22
+#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID        (1ULL << MSR_BIT_LIMIT_CPUID);
 #define MSR_IA32_MISC_ENABLE_XTPR_DISABLE       (1ULL << 23)
 #define MSR_IA32_MISC_ENABLE_XD_DISABLE         (1ULL << 34)
 
@@ -385,7 +387,8 @@
 #define MSR_IA32_MISC_ENABLE_SPLIT_LOCK_DISABLE (1ULL << 4)
 #define MSR_IA32_MISC_ENABLE_L3CACHE_DISABLE    (1ULL << 6)
 #define MSR_IA32_MISC_ENABLE_SUPPRESS_LOCK      (1ULL << 8)
-#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE   (1ULL << 9)
+#define MSR_BIT_PRF_DIS                         9
+#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE   (1ULL << MSR_BIT_PRF_DIS)
 #define MSR_IA32_MISC_ENABLE_FERR               (1ULL << 10)
 #define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX     (1ULL << 10)
 #define MSR_IA32_MISC_ENABLE_TM2                (1ULL << 13)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5cd9bfabd645..44ca6317af43 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -31,11 +31,7 @@ static void early_init_intel(struct cpuinfo_x86 *c)
 
         /* Unmask CPUID levels if masked: */
         if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
-                rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
-                if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
-                        misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
-                        wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+                if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_LIMIT_CPUID) > 0) {
                         c->cpuid_level = cpuid_eax(0);
                         get_cpu_cap(c);
                 }
@@ -129,16 +125,9 @@ static void early_init_intel(struct cpuinfo_x86 *c)
          * Ingo Molnar reported a Pentium D (model 6) and a Xeon
          * (model 2) with the same problem.
          */
-        if (c->x86 == 15) {
-                rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
-                if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
-                        printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
-
-                        misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
-                        wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-                }
-        }
+        if (c->x86 == 15)
+                if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_FAST_STRING) > 0)
+                        pr_info("kmemcheck: Disabling fast string operations\n");
 #endif
 
         /*
@@ -197,8 +186,6 @@ static void intel_smp_check(struct cpuinfo_x86 *c)
 
 static void intel_workarounds(struct cpuinfo_x86 *c)
 {
-        unsigned long lo, hi;
-
 #ifdef CONFIG_X86_F00F_BUG
         /*
          * All current models of Pentium and Pentium with MMX technology CPUs
@@ -229,12 +216,9 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
          * Hardware prefetcher may cause stale data to be loaded into the cache.
          */
         if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
-                rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
-                if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
-                        printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
-                        printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
-                        lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
-                        wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
+                if (msr_set_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_PRF_DIS) > 0) {
+                        pr_info("CPU: C0 stepping P4 Xeon detected.\n");
+                        pr_info("CPU: Disabling hardware prefetching (Errata 037)\n");
                 }
         }