I couldn't reproduce this with 2.6.35 (without Peter's change),
I was trying on VirtualBox. If the detection code is causing a
problem we can just skip it if the CPU has cpuid.
Incidentally if you need some hardware to test the RDC port on I can
arrange that.
regards,
Mark
--- On Tue, 3/8/10, Ingo Molnar <mingo@xxxxxxx> wrote:
> From: Ingo Molnar <mingo@xxxxxxx>
> Subject: Re: [tip:x86/cpu] x86, cpu: RDC doesn't have CPUID, which is what c_ident is
> To: mingo@xxxxxxxxxx, hpa@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, florian@xxxxxxxxxxx, mark@xxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, hpa@xxxxxxxxxxxxxxx
> Cc: linux-tip-commits@xxxxxxxxxxxxxxx
> Date: Tuesday, 3 August, 2010, 20:25
>
> * tip-bot for H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
> wrote:
>
> > Commit-ID:
> c0366f5f5c1615c4f70b1bd646149ba9233830b9
> > Gitweb: http://git.kernel.org/tip/c0366f5f5c1615c4f70b1bd646149ba9233830b9
> > Author: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
> > AuthorDate: Tue, 3 Aug 2010 10:09:56 -0700
> > Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
> > CommitDate: Tue, 3 Aug 2010 10:09:56 -0700
> >
> > x86, cpu: RDC doesn't have CPUID, which is what
> c_ident is
> >
> > c_ident is supposed to be a CPUID identifier, and RDC
> doesn't have
> > that.
>
> -tip testing found that these RDC patches cause a boot
> crash if a
> X86_RDC321X=y kernel is booted on a regular PC:
>
> [ 0.015999] Pid: 0, comm: swapper Not tainted
> 2.6.35-tip+ #23896 A8N-E/System Product Name
>
> [ 0.015999] EIP: 0060:[<c1267d14>]
> EFLAGS: 00010282 CPU: 0
>
>
> [ 0.015999] EIP is at strcmp+0xf/0x22
>
>
>
>
> [ 0.015999] EAX: c1a81541 EBX: 00000004 ECX:
> 0000000f EDX: 00000000
>
>
> [ 0.015999] ESI: c1a81571 EDI: 00000000 EBP:
> c19ccf78 ESP: c19ccf70
>
>
> [ 0.015999] DS: 007b ES: 007b FS: 00d8
> GS: 00e0 SS: 0068
>
>
> [ 0.015999] Process swapper (pid: 0,
> ti=c19cc000 task=c1a07e60 task.ti=c19cc000)
>
> [ 0.015999] Stack:
>
>
>
>
>
> [ 0.015999] c1a81530 c1a81570 c19ccf8c
> c16d9b7f c1ac8538 c1a81530 c1a81570 c19ccfac
>
> [ 0.015999] <0> c16d9dcb c104dc9f
> c1a15210 c1a81548 c1ac8538 00099800 c19ce000 c19ccfb4
>
> [ 0.015999] <0> c1a89a4f c19ccfc0
> c1a89d2d c1a96147 c19ccfe0 c1a84953 431d9715 00000006
>
> [ 0.015999] Call Trace:
>
>
>
>
>
> [ 0.015999] [<c16d9b7f>] ?
> get_cpu_vendor+0x22/0x8f
>
>
>
> [ 0.015999] [<c16d9dcb>] ?
> identify_cpu+0xc5/0x2e0
>
>
>
> [ 0.015999] [<c104dc9f>] ?
> sub_preempt_count+0x9/0x39
>
>
>
> [ 0.015999] [<c1a89a4f>] ?
> identify_boot_cpu+0xd/0x23
>
>
>
> [ 0.015999] [<c1a89d2d>] ?
> check_bugs+0xb/0xaf
>
>
>
> [ 0.015999] [<c1a96147>] ?
> cpuset_init+0x65/0x77
>
>
>
> [ 0.015999] [<c1a84953>] ?
> start_kernel+0x37e/0x392
>
>
>
> [ 0.015999] [<c1a840c9>] ?
> i386_start_kernel+0xc9/0xd0
>
>
> [ 0.015999] Code: c0 83 c9 ff f2 ae 4f 89 d1
> 49 78 06 ac aa 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5
> [ 0.015999] EIP: [<c1267d14>]
> strcmp+0xf/0x22 SS:ESP 0068:c19ccf70
>
>
>
> mercury:~> cat /proc/cpuinfo
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 35
> model name : AMD Athlon(tm) 64 X2 Dual
> Core Processor 3800+
> stepping : 2
> cpu MHz : 2010.301
> cache size : 512 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 2
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse
> tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36
> clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm
> 3dnowext 3dnow rep_good pni lahf_lm cmp_legacy
> bogomips : 4021.85
> 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
>
> config attached.
>
> Thanks,
>
> Ingo
>
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