performance counters: x86 support

Implement performance counters for x86 Intel CPUs.

It's simplified right now: the PERFMON CPU feature is assumed,
which is available in Core2 and later Intel CPUs.

The design is flexible to be extended to more CPU types as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d4d4cb7629ea..f2fdc1867241 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -643,6 +643,7 @@ config X86_UP_IOAPIC
 config X86_LOCAL_APIC
         def_bool y
         depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
+        select HAVE_PERF_COUNTERS
 
 config X86_IO_APIC
         def_bool y