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Currently the while loop always either exits on the first iteration with
a core PMU, or exits with NULL on heterogeneous systems or when not all
CPUs are online.
Both of the latter behaviors are undesirable for platforms other than
Arm so simplify it to always return the first core PMU, or NULL if none
exist.
This behavior was depended on by the Arm version of
pmu_metrics_table__find(), so the logic has been moved there instead.
Signed-off-by: James Clark <james.clark@arm.com>
Suggested-by: Ian Rogers <irogers@google.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Haixin Yu <yuhaixin.yhx@linux.alibaba.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230913153355.138331-3-james.clark@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
105e5b433e