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When we saves the branch stack to the perf sample data, we needs to update the sample flags and the dynamic size. To make sure this is done consistently, add the perf_sample_save_brstack() helper and convert all call sites. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230118060559.615653-5-namhyung@kernel.org