linux-kernel - [tip:perf/core] perf/x86/intel: Use new topology_max_smt

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Date:	Fri, 3 Jun 2016 03:54:23 -0700
From:	tip-bot for Andi Kleen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, mingo@...nel.org, torvalds@...ux-foundation.org,
	hpa@...or.com, eranian@...gle.com, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, jolsa@...hat.com,
	alexander.shishkin@...ux.intel.com, vincent.weaver@...ne.edu,
	peterz@...radead.org
Subject: [tip:perf/core] perf/x86/intel: Use new topology_max_smt_threads()
 in HT leak workaround

Commit-ID:  030ba6cd105c68ce919c5e239853b567490cd059
Gitweb:     http://git.kernel.org/tip/030ba6cd105c68ce919c5e239853b567490cd059
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Thu, 19 May 2016 17:09:59 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 3 Jun 2016 09:41:25 +0200

perf/x86/intel: Use new topology_max_smt_threads() in HT leak workaround

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

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: acme@...nel.org
Cc: jolsa@...nel.org
Link: http://lkml.kernel.org/r/1463703002-19686-6-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 593b167..5081b4c 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3989,16 +3989,14 @@ __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;
 	}