linux-kernel - [PATCH V5 3/8] perf: Add branch_sample_call

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Date:   Wed, 25 Oct 2023 13:16:21 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, irogers@...gle.com,
        adrian.hunter@...el.com, ak@...ux.intel.com, eranian@...gle.com,
        alexey.v.bayduraev@...ux.intel.com, tinghao.zhang@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V5 3/8] perf: Add branch_sample_call_stack

From: Kan Liang <kan.liang@...ux.intel.com>

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@...ux.intel.com>
---

No changes since V4

 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 40c9af124128..09050641ce5d 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 7897ef066027..ac1a59c1f252 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1144,6 +1144,11 @@ static inline bool branch_sample_counters(const struct perf_event *event)
 	return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS;
 }
 
+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