linux-kernel - [PATCH 8/8] perf/core: Call perf_prepare

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Message-Id: <20230112214015.1014857-9-namhyung@kernel.org>
Date:   Thu, 12 Jan 2023 13:40:15 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, Song Liu <song@...nel.org>,
        bpf@...r.kernel.org
Subject: [PATCH 8/8] perf/core: Call perf_prepare_sample() before running BPF

As BPF can access sample data, it needs to populate the data.  Also
remove the logic to get the callchain specifically as it's covered by
the perf_prepare_sample() now.

Cc: Song Liu <song@...nel.org>
Cc: bpf@...r.kernel.org
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/events/core.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5c4f3fa3d2b7..af8365fb639a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10363,13 +10363,7 @@ static void bpf_overflow_handler(struct perf_event *event,
 	rcu_read_lock();
 	prog = READ_ONCE(event->prog);
 	if (prog) {
-		if (prog->call_get_stack &&
-		    (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) &&
-		    !(data->sample_flags & PERF_SAMPLE_CALLCHAIN)) {
-			data->callchain = perf_callchain(event, regs);
-			data->sample_flags |= PERF_SAMPLE_CALLCHAIN;
-		}
-
+		perf_prepare_sample(data, event, regs);
 		ret = bpf_prog_run(prog, &ctx);
 	}
 	rcu_read_unlock();
-- 
2.39.0.314.g84b9a713c41-goog