I have done another test: i insert powernow-k8 driver as module not built-in and now when i try to insert powernow-k8 kernel module i have a segfault (but seems that so, before do a segfault found cpu frequencies:

powernow-k8: Found 1 AMD Turion(tm) 64 Mobile Technology ML-30 processors (version 2.00.00) powernow-k8: 0 : fid 0x8, vid 0x4 powernow-k8: 1 : fid 0x0, vid 0x16 powernow-k8: 0 : fid 0x8 (1600 MHz), vid 0x4 powernow-k8: 1 : fid 0x0 (800 MHz), vid 0x16 general protection fault: 0000 [1] SMP CPU 0 Modules linked in: powernow_k8 snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device rtc_sysfs rtc_dev rtc_proc rtc_core rtc_lib video processor ac button dm_crypt ipt_REJECT ipt_LOG xt_state nf_conntrack nfnetlink iptable_filter ip_tables x_tables pktcdvd psmouse radeon drm 8139too capability commoncap tsdev evdev usbmouse usbhid sdhci mmc_core ohci1394 ieee1394 snd_atiixp snd_atiixp_modem snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore snd_page_alloc ehci_hcd ohci_hcd Pid: 5485, comm: modprobe Not tainted 2.6.18-xen #2 RIP: e030:[<ffffffff880a8060>] [<ffffffff880a8060>] :powernow_k8:pending_bit_stuck+0x10/0x20 RSP: e02b:ffff880035ecdbd0 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 0000000000001600 RCX: 00000000c0010042 RDX: ffffffffff578000 RSI: 0000000000000000 RDI: ffff880001e39420 RBP: ffff880037b20200 R08: 0000000000000036 R09: 0000000000000000 R10: ffff880037b20200 R11: 0000000000000002 R12: 0000000000000001 R13: 000000000000000f R14: ffff8800367308c0 R15: ffff880036522730 FS: 00002b9b7af5bae0(0000) GS:ffffffff806fc000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 Process modprobe (pid: 5485, threadinfo ffff880035ecc000, task ffff8800009bd040) Stack: ffffffff880a9d85 ffff880035ecdc68 0000000000000060 ffff8800367308f8 00000001349ebf08 ffff880036522720 ffff880036522720 0000000000000002 0000000000000060 0000000100000001 ffffffff807741e8 ffffffff806a30a0 Call Trace: [<ffffffff880a9d85>] :powernow_k8:powernowk8_cpu_init+0xb45/0xdd0 [<ffffffff804e4884>] cpufreq_add_dev+0x174/0x540 [<ffffffff8022b6e3>] __wake_up+0x43/0x70 [<ffffffff8020d540>] monotonic_clock+0x50/0xa0 [<ffffffff805a54f5>] thread_return+0x0/0x13b [<ffffffff805a54f5>] thread_return+0x0/0x13b [<ffffffff804304f6>] sysdev_driver_register+0x96/0x100 [<ffffffff804e3947>] cpufreq_register_driver+0xc7/0x1b0 [<ffffffff80253faf>] sys_init_module+0x189f/0x1aa0 [<ffffffff8020a2ee>] system_call+0x86/0x8b [<ffffffff8020a268>] system_call+0x0/0x8b

Code: 0f 32 c1 e8 1f f3 c3 66 66 90 66 66 90 66 66 90 8b 57 60 85 RIP [<ffffffff880a8060>] :powernow_k8:pending_bit_stuck+0x10/0x20 RSP <ffff880035ecdbd0>