From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 7 Jul 2016 17:37:52 +0000 (+0200)
Subject: perf/x86/intel: Eliminate dead code in intel_pmu_lbr_del()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c3a61a2c5c6b6b4dd878812507c681c9aec3ed17;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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 e7b58c2c2250..1bd72e900498 100644
--- 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)