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>

1 files changed, 3 insertions, 11 deletions

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);
 }