[PATCH V3 3/6] perf: Add branch_sample_call_stack

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

Add a helper function to check call stack sample type.

The later patch will invoke the function in several places.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---

New patch

 arch/x86/events/core.c     | 2 +-
 include/linux/perf_event.h | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 2919bb5a53a0..b56e9c3a0cc8 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -601,7 +601,7 @@ int x86_pmu_hw_config(struct perf_event *event)
 		}
 	}
 
-	if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK)
+	if (branch_sample_call_stack(event))
 		event->attach_state |= PERF_ATTACH_TASK_DATA;
 
 	/*
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c4877924d43c..58ad6745cdda 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1147,6 +1147,11 @@ static inline bool branch_sample_evt_cntrs(const struct perf_event *event)
 	return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_EVT_CNTRS;
 }
 
+static inline bool branch_sample_call_stack(const struct perf_event *event)
+{
+	return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK;
+}
+
 struct perf_sample_data {
 	/*
 	 * Fields set by perf_sample_data_init() unconditionally,
-- 
2.35.1