linux-kernel - Re: [tip:x86/cpu] x86, cpu: RDC doesn't have CPUID, which is what c

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Message-ID: <20100803192557.GA13595@elte.hu>
Date:	Tue, 3 Aug 2010 21:25:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	florian@...nwrt.org, mark@...feros.com, tglx@...utronix.de,
	hpa@...ux.intel.com
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/cpu] x86, cpu: RDC doesn't have CPUID, which is what
 c_ident is


* tip-bot for H. Peter Anvin <hpa@...ux.intel.com> wrote:

> Commit-ID:  c0366f5f5c1615c4f70b1bd646149ba9233830b9
> Gitweb:     http://git.kernel.org/tip/c0366f5f5c1615c4f70b1bd646149ba9233830b9
> Author:     H. Peter Anvin <hpa@...ux.intel.com>
> AuthorDate: Tue, 3 Aug 2010 10:09:56 -0700
> Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> 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

View attachment "config" of type "text/plain" (66895 bytes)