perf/x86/intel: Eliminate dead code in intel_pmu_lbr_del()

Since pmu::del() is always called under perf_pmu_disable(), the block
conditional on cpuc->enabled is dead.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index e7b58c2..1bd72e9 100644 (file)
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -467,12 +467,6 @@ void intel_pmu_lbr_del(struct perf_event *event)
        cpuc->lbr_users--;
        WARN_ON_ONCE(cpuc->lbr_users < 0);
        perf_sched_cb_dec(event->ctx->pmu);
-
-       if (cpuc->enabled && !cpuc->lbr_users) {
-               __intel_pmu_lbr_disable();
-               /* avoid stale pointer */
-               cpuc->lbr_context = NULL;
-       }
 }
 
 void intel_pmu_lbr_enable_all(bool pmi)