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Subject[2.6.32] WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_dummy+0x30/0x3c()
Running a vanilla 2.6.32 as Xen DomU, I'm getting:

[ 0.000999] CPU: Physical Processor ID: 0
[ 0.000999] CPU: Processor Core ID: 1
[ 0.000999] Performance Events: AMD PMU driver.
[ 0.000999] ------------[ cut here ]------------
[ 0.000999] WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_dummy+0x30/0x3c()
[ 0.000999] Modules linked in:
[ 0.000999] Pid: 0, comm: swapper Not tainted 2.6.32 #3
[ 0.000999] Call Trace:
[ 0.000999] [<ffffffff8102611a>] ? native_apic_write_dummy+0x30/0x3c
[ 0.000999] [<ffffffff8104c5a2>] warn_slowpath_common+0x77/0x8f
[ 0.000999] [<ffffffff8104c5c9>] warn_slowpath_null+0xf/0x11
[ 0.000999] [<ffffffff8102611a>] native_apic_write_dummy+0x30/0x3c
[ 0.000999] [<ffffffff8101bf49>] perf_events_lapic_init+0x2e/0x30
[ 0.000999] [<ffffffff818cc6fe>] init_hw_perf_events+0x300/0x39d
[ 0.000999] [<ffffffff818cc25a>] identify_boot_cpu+0x3c/0x3e
[ 0.000999] [<ffffffff818cc3da>] check_bugs+0x9/0x2d
[ 0.000999] [<ffffffff818c4cae>] start_kernel+0x37a/0x38f
[ 0.000999] [<ffffffff818c42c1>] x86_64_start_reservations+0xac/0xb0
[ 0.000999] [<ffffffff818c7b79>] xen_start_kernel+0x530/0x534
[ 0.000999] ---[ end trace 4eaa2a86a8e2da22 ]---
[ 0.000999] ... version: 0
[ 0.000999] ... bit width: 48
[ 0.000999] ... generic registers: 4
[ 0.000999] ... value mask: 0000ffffffffffff
[ 0.000999] ... max period: 00007fffffffffff
[ 0.000999] ... fixed-purpose events: 0
[ 0.000999] ... event mask: 000000000000000f
[ 0.000999] SMP alternatives: switching to UP code

# uname -a
Linux fatush.arschkrebs.de 2.6.32 #3 SMP Tue Dec 8 22:09:42 CET 2009 x86_64 GNU/Linux

# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 67
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 5600+
stepping : 3
cpu MHz : 2799.966
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu de tsc msr pae cx8 cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow up rep_good pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips : 5599.93
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

--
Ralf Hildebrandt
Geschäftsbereich IT | Abteilung Netzwerk
Charité - Universitätsmedizin Berlin
Campus Benjamin Franklin
Hindenburgdamm 30 | D-12203 Berlin
Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
ralf.hildebrandt@charite.de | http://www.charite.de

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