[PATCH 12/12] x86, perf: Use new ht_on flag in HT leak workaround

From: Andi Kleen
Date: Tue Jan 19 2016 - 21:29:21 EST


From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Now that we have a convenient ht_on flag in x86_pmu use it
to detect the HT workarounds for older CPUs.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index a34b0be..a20044d 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -3832,16 +3832,14 @@ __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 (x86_pmu.ht_on) {
pr_info("PMU erratum BJ122, BV98, HSD29 worked around, HT is on\n");
return 0;
}
--
2.4.3