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auxv_generic_compat_pmu() utility function is to detect whether the system is having generic compat PMU. The check is based on base platform value from /proc/self/auxv. Update the comment with details on how auxv is used to detect the platform. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250113075858.45137-5-atrajeev@linux.vnet.ibm.com