Latest working kernel version:unknown Earliest failing kernel version: Distribution:Fedora 8 Hardware Environment:Intel harpertown & hahelem Software Environment: Problem Description: only 2 cpus found after disable some LCPUS by CPU HOTPLUG feature. [alexs@lkp-st01-x8664 ~]$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Genuine Intel(R) CPU @ 2.66GHz stepping : 11 cpu MHz : 2660.005 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca lahf_lm bogomips : 5320.01 clflush size : 64 cache_alignment : 64 address sizes : 38 bits physical, 48 bits virtual power management: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Genuine Intel(R) CPU @ 2.66GHz stepping : 11 cpu MHz : 2660.005 cache size : 4096 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca lahf_lm bogomips : 5320.13 clflush size : 64 cache_alignment : 64 address sizes : 38 bits physical, 48 bits virtual power management: [alexs@lkp-st01-x8664 ~]$ cat /proc/interrupts CPU0 CPU2 CPU4 CPU5 CPU6 CPU7 0: 29 0 0 0 0 0 IO-APIC-edge timer 1: 1 0 0 0 0 1 IO-APIC-edge i8042 3: 0 1 0 0 1 0 IO-APIC-edge 4: 44 35 48 47 28 46 IO-APIC-edge serial 9: 0 0 0 0 0 0 IO-APIC-fasteoi acpi 12: 0 1 1 0 1 0 IO-APIC-edge i8042 14: 26 24 34 14 32 15 IO-APIC-edge ide0 17: 8 6 6 8 6 7 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2 18: 0 0 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb4 19: 34171 32765 13804 699 12332 697 IO-APIC-fasteoi ahci, uhci_hcd:usb3 28: 11 16 9 8 89642 14 IO-APIC-fasteoi eth2 198: 1282 47633 1641 1640 9 1656 PCI-MSI-edge eth3 NMI: 0 0 0 0 0 0 Non-maskable interrupts LOC: 13165275 13165482 13165424 12586776 13165261 12588924 Local timer interrupts RES: 215710 209353 214538 214149 209574 210073 Rescheduling interrupts CAL: 209 225 227 222 224 52 function call interrupts TLB: 3904740 3799777 3908838 3887585 3828639 3853560 TLB shootdowns TRM: 0 0 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 0 0 Threshold APIC interrupts SPU: 0 0 0 0 0 0 Spurious interrupts ERR: 0 [alexs@lkp-st01-x8664 ~]$ cat /sys/devices/system/cpu/online 0,2,4-7 Steps to reproduce: 1, echo 0 > /sys/devices/system/cpu/cpuX/online 2, cat /proc/cpuinfo
Not reproducible here. Can you please retest against latest mainline ?
Any update to this ?