x86: convert TSC disabling to generic cpuid disable bitmap

Fix from: Ian Campbell <ijc@hellion.org.uk>

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

6 files changed, 7 insertions, 24 deletions

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index a96abd453e0d..9b95edcfc6ae 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -154,7 +154,7 @@ static void __init check_config(void)
  * If we configured ourselves for a TSC, we'd better have one!
  */
 #ifdef CONFIG_X86_TSC
-        if (!cpu_has_tsc && !tsc_disable)
+        if (!cpu_has_tsc)
                 panic("Kernel compiled for Pentium+, requires TSC feature!");
 #endif
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c66991a04a8a..dfc9563fc4f0 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -446,10 +446,6 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
          * we do "generic changes."
          */
 
-        /* TSC disabled? */
-        if ( tsc_disable )
-                clear_bit(X86_FEATURE_TSC, c->x86_capability);
-
         /* If the model name is still unset, do table lookup. */
         if ( !c->x86_model_id[0] ) {
                 char *p;
@@ -650,11 +646,6 @@ void __cpuinit cpu_init(void)
 
         if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
                 clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
-        if (tsc_disable && cpu_has_tsc) {
-                printk(KERN_NOTICE "Disabling TSC...\n");
-                /**** FIX-HPA: DOES THIS REALLY BELONG HERE? ****/
-                clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
-        }
 
         load_idt(&idt_descr);
         switch_to_new_gdt();
diff --git a/arch/x86/kernel/numaq_32.c b/arch/x86/kernel/numaq_32.c
index 9000d82c6dc0..e65281b1634b 100644
--- a/arch/x86/kernel/numaq_32.c
+++ b/arch/x86/kernel/numaq_32.c
@@ -82,7 +82,7 @@ static int __init numaq_tsc_disable(void)
 {
         if (num_online_nodes() > 1) {
                 printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
-                tsc_disable = 1;
+                setup_clear_cpu_cap(X86_FEATURE_TSC);
         }
         return 0;
 }
diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c
index 2a7b95bd8509..43517e324be8 100644
--- a/arch/x86/kernel/tsc_32.c
+++ b/arch/x86/kernel/tsc_32.c
@@ -24,8 +24,6 @@ static int tsc_enabled;
 unsigned int tsc_khz;
 EXPORT_SYMBOL_GPL(tsc_khz);
 
-int tsc_disable;
-
 #ifdef CONFIG_X86_TSC
 static int __init tsc_setup(char *str)
 {
@@ -40,8 +38,7 @@ static int __init tsc_setup(char *str)
  */
 static int __init tsc_setup(char *str)
 {
-        tsc_disable = 1;
-
+        setup_clear_cpu_cap(X86_FEATURE_TSC);
         return 1;
 }
 #endif
@@ -395,7 +392,7 @@ void __init tsc_init(void)
 {
         int cpu;
 
-        if (!cpu_has_tsc || tsc_disable)
+        if (!cpu_has_tsc)
                 goto out_no_tsc;
 
         cpu_khz = calculate_cpu_khz();
@@ -439,10 +436,5 @@ void __init tsc_init(void)
         return;
 
 out_no_tsc:
-        /*
-         * Set the tsc_disable flag if there's no TSC support, this
-         * makes it a fast flag for the kernel to see whether it
-         * should be using the TSC.
-         */
-        tsc_disable = 1;
+        setup_clear_cpu_cap(X86_FEATURE_TSC);
 }
diff --git a/arch/x86/mach-voyager/setup.c b/arch/x86/mach-voyager/setup.c
index 81257a861984..5ae5466b9eb9 100644
--- a/arch/x86/mach-voyager/setup.c
+++ b/arch/x86/mach-voyager/setup.c
@@ -37,7 +37,7 @@ void __init pre_setup_arch_hook(void)
 {
         /* Voyagers run their CPUs from independent clocks, so disable
          * the TSC code because we can't sync them */
-        tsc_disable = 1;
+        setup_clear_cpu_cap(X86_FEATURE_TSC);
 }
 
 void __init trap_init_hook(void)
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index d083ff5ef088..b3721fd6877b 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -592,7 +592,7 @@ __init void xen_time_init(void)
         set_normalized_timespec(&wall_to_monotonic,
                                 -xtime.tv_sec, -xtime.tv_nsec);
 
-        tsc_disable = 0;
+        setup_force_cpu_cap(X86_FEATURE_TSC);
 
         xen_setup_timer(cpu);
         xen_setup_cpu_clockevents();