x86/tsc_msr: Identify Intel-specific code

try_msr_calibrate_tsc() is currently Intel-specific,
and should not execute on any other vendor's parts.

Signed-off-by: Len Brown <len.brown@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1fe23c052826bdcfeb3d45045aa02246078cb5a7.1466138954.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 6aa0f4d..4ec5e56 100644 (file)
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -86,6 +86,9 @@ unsigned long try_msr_calibrate_tsc(void)
        unsigned long res;
        int cpu_index;
 
+       if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+               return 0;
+
        cpu_index = match_cpu(boot_cpu_data.x86, boot_cpu_data.x86_model);
        if (cpu_index < 0)
                return 0;