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Diffstat (limited to 'arch/x86/events/intel/lbr.c')
-rw-r--r--arch/x86/events/intel/lbr.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index f924629836a8..955457a30197 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -18,7 +18,7 @@ enum {
LBR_FORMAT_MAX_KNOWN = LBR_FORMAT_TIME,
};
-static enum {
+static const enum {
LBR_EIP_FLAGS = 1,
LBR_TSX = 2,
} lbr_desc[LBR_FORMAT_MAX_KNOWN + 1] = {
@@ -287,7 +287,7 @@ inline u64 lbr_from_signext_quirk_wr(u64 val)
/*
* If quirk is needed, ensure sign extension is 61 bits:
*/
-u64 lbr_from_signext_quirk_rd(u64 val)
+static u64 lbr_from_signext_quirk_rd(u64 val)
{
if (static_branch_unlikely(&lbr_from_quirk_key)) {
/*
@@ -380,8 +380,12 @@ static void __intel_pmu_lbr_save(struct x86_perf_task_context *task_ctx)
void intel_pmu_lbr_sched_task(struct perf_event_context *ctx, bool sched_in)
{
+ struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
struct x86_perf_task_context *task_ctx;
+ if (!cpuc->lbr_users)
+ return;
+
/*
* If LBR callstack feature is enabled and the stack was saved when
* the task was scheduled out, restore the stack. Otherwise flush