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charset="utf-8" The ldlat dependency on l3missonly is specific to Zen 5; newer generations are not affected. This quirk is documented as an erratum in the following Revision Guide. Erratum: 1606 IBS (Instruction Based Sampling) OP Load Latency Filtering May Capture Unwanted Samples When L3Miss Filtering is Disabled Revision Guide for AMD Family 1Ah Models 00h-0Fh Processors, Pub. 58251 Rev. 1.30 July 2025 https://bugzilla.kernel.org/attachment.cgi?id=3D309193 Signed-off-by: Ravi Bangoria --- arch/x86/events/amd/ibs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index 705ef43325be..e0b64cb13bf9 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -356,7 +356,10 @@ static int perf_ibs_init(struct perf_event *event) ldlat >>=3D 7; =20 config |=3D (ldlat - 1) << 59; - config |=3D IBS_OP_L3MISSONLY | IBS_OP_LDLAT_EN; + + config |=3D IBS_OP_LDLAT_EN; + if (cpu_feature_enabled(X86_FEATURE_ZEN5)) + config |=3D IBS_OP_L3MISSONLY; } =20 /* --=20 2.43.0