From: Livio Soares <livio@eecg.toronto.edu>
Date: Thu, 3 Jun 2010 19:00:31 +0000 (-0400)
Subject: perf, x86: Small fix to cpuid10_edx
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=e768aee89c687a50e6a2110e30c5cae1fbf0d2da;p=deliverable%2Flinux.git

perf, x86: Small fix to cpuid10_edx

Fixes to 'cpuid10_edx' to comply with Intel documentation.
According to the Intel Manual, Volume 2A, Table 3-12, the cpuid for
architecture performance monitoring returns, in EDX, two pieces of
information:

  1) Number of fixed-function counters (5 bits, not 4)
  2) Width of fixed-function counters (8 bits)

Signed-off-by: Livio Soares <livio@eecg.toronto.edu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 254883d0c7e0..6ed3ae4f5482 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -68,8 +68,9 @@ union cpuid10_eax {
 
 union cpuid10_edx {
 	struct {
-		unsigned int num_counters_fixed:4;
-		unsigned int reserved:28;
+		unsigned int num_counters_fixed:5;
+		unsigned int bit_width_fixed:8;
+		unsigned int reserved:19;
 	} split;
 	unsigned int full;
 };