dmesg says CPU has Pentium F0 0F bug..../proc/cpuinfo says it hasnt

[Dave Jones]

On Fri, Jun 30, 2006 at 03:15:17AM +0100, 0 wrote:
 > Hi,
 > 
 > dmesg indicates my CPU has the Pentium F0 0F bug...
 > 
 > Initializing CPU#0
 > CPU 0 irqstacks, hard=c041e000 soft=c041f000
 > PID hash table entries: 1024 (order: 10, 16384 bytes)
 > Detected 232.300 MHz processor.
 > Using tsc for high-res timesource
 > Console: colour dummy device 80x25
 > Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
 > Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
 > Memory: 124684k/131072k available (2212k kernel code, 5888k reserved, 
 > 752k data, 200k init, 0k highmem)
 > Checking if this processor honours the WP bit even in supervisor mode... Ok.
 > Calibrating delay using timer specific routine.. 465.42 BogoMIPS 
 > (lpj=930843)
 > Security Framework v1.0.0 initialized
 > SELinux:  Disabled at boot.
 > Capability LSM initialized
 > Mount-cache hash table entries: 512
 > CPU: After generic identify, caps: 008001bf 00000000 00000000 00000000 
 > 00000000 00000000 00000000
 > CPU: After vendor identify, caps: 008001bf 00000000 00000000 00000000 
 > 00000000 00000000 00000000
 > *Intel Pentium with F0 0F bug - workaround enabled.*
 > CPU: After all inits, caps: 008001bf 00000000 00000000 00000000 00000000 
 > 00000000 00000000
 > CPU: Intel Pentium MMX stepping 03
 > Checking 'hlt' instruction... OK.
 > 
 > 
 > But looking at /proc/cpuinfo indicates the opposite:
 > 
 > processor       : 0
 > vendor_id       : GenuineIntel
 > cpu family      : 5
 > model           : 4
 > model name      : Pentium MMX
 > stepping        : 3
 > cpu MHz         : 232.300
 > fdiv_bug        : no
 > hlt_bug         : no
 > *f00f_bug        : no*
 > coma_bug        : no
 > fpu             : yes
 > fpu_exception   : yes
 > cpuid level     : 1
 > wp              : yes
 > flags           : fpu vme de pse tsc msr mce cx8 mmx
 > bogomips        : 465.42
 > 
 > Think there may be a bug in cpuinfo, because I'm sure I remember it used 
 > to say yes for the f00f_bug.
 > 
 > Any thoughts?

Please file a bugzilla on this. And mention which kernel version you're
running. (Be sure to try the newest too).

		Dave

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