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Use the new sample_flags to indicate whether the data_src field is filled by the PMU driver. Remove the data_src field from the perf_sample_data_init() to minimize the number of cache lines touched. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220901130959.1285717-6-kan.liang@linux.intel.com