Re: [PATCH 2/3] perf: Fix low freq setting via IOC_PERIOD

On 17-Jan-25 8:49 PM, kan.liang@linux.intel.com wrote:

From: Kan Liang kan.liang@linux.intel.com

A low freq cannot be set via IOC_PERIOD on some platforms.

The perf_event_check_period() introduced in commit 81ec3f3c4c4d ("perf/x86: Add check_period PMU callback") intended to check the period, rather than the freq. A low freq may be mistakenly rejected by the limit_period().

Fixes: 81ec3f3c4c4d ("perf/x86: Add check_period PMU callback") Closes: https://lore.kernel.org/lkml/20250115154949.3147-1-ravi.bangoria@amd.com/ Signed-off-by: Kan Liang kan.liang@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Ravi Bangoria ravi.bangoria@amd.com Cc: stable@vger.kernel.org

Reviewed-by: Ravi Bangoria ravi.bangoria@amd.com

Thanks, Ravi