linux-kernel - [PATCH 5/8] perf/x86/intel: Use new topology_max_smt

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Date:	Thu, 19 May 2016 17:09:59 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...nel.org
Cc:	peterz@...radead.org, jolsa@...nel.org,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 5/8] perf/x86/intel: Use new topology_max_smt_threads() in HT leak workaround

From: Andi Kleen <ak@...ux.intel.com>

Now that we have topology_max_smt_threads() use it
to detect the HT workarounds for older CPUs.

v2: Use topology_max_smt_threads()
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/events/intel/core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index b337ad7db2b2..12b438435999 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3991,16 +3991,14 @@ __init int intel_pmu_init(void)
  */
 static __init int fixup_ht_bug(void)
 {
-	int cpu = smp_processor_id();
-	int w, c;
+	int c;
 	/*
 	 * problem not present on this CPU model, nothing to do
 	 */
 	if (!(x86_pmu.flags & PMU_FL_EXCL_ENABLED))
 		return 0;
 
-	w = cpumask_weight(topology_sibling_cpumask(cpu));
-	if (w > 1) {
+	if (topology_max_smt_threads() > 1) {
 		pr_info("PMU erratum BJ122, BV98, HSD29 worked around, HT is on\n");
 		return 0;
 	}
-- 
2.5.5