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authorKan Liang <[email protected]>2018-04-25 14:57:17 -0400
committerThomas Gleixner <[email protected]>2018-04-25 21:41:22 +0200
commit4e949e9b9d1e3edcdab3b54656c5851bd9e49c67 (patch)
tree13ba7875d137a83f1c330c8a7476d3267da50050 /scripts/gdb/linux
parent6d08b06e67cd117f6992c46611dfb4ce267cd71e (diff)
perf/x86/intel: Don't enable freeze-on-smi for PerfMon V1
The SMM freeze feature was introduced since PerfMon V2. But the current code unconditionally enables the feature for all platforms. It can generate #GP exception, if the related FREEZE_WHILE_SMM bit is set for the machine with PerfMon V1. To disable the feature for PerfMon V1, perf needs to - Remove the freeze_on_smi sysfs entry by moving intel_pmu_attrs to intel_pmu, which is only applied to PerfMon V2 and later. - Check the PerfMon version before flipping the SMM bit when starting CPU Fixes: 6089327f5424 ("perf/x86: Add sysfs entry to freeze counters on SMI") Signed-off-by: Kan Liang <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected]
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