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[PATCH] x86-64/i386: Intel HT, Multi core detection fixes

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Fields obtained through cpuid vector 0x1(ebx[16:23]) and
vector 0x4(eax[14:25], eax[26:31]) indicate the maximum values and might not
always be the same as what is available and what OS sees.  So make sure
"siblings" and "cpu cores" values in /proc/cpuinfo reflect the values as seen
by OS instead of what cpuid instruction says. This will also fix the buggy BIOS
cases (for example where cpuid on a single core cpu says there are "2" siblings,
even when HT is disabled in the BIOS.
http://bugzilla.kernel.org/show_bug.cgi?id=4359)

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Siddha, Suresh B
2005-11-05 17:25:54 +01:00
committed by Linus Torvalds
parent e90f22edf4
commit 94605eff57
11 changed files with 178 additions and 110 deletions
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arch/i386/kernel/cpu/intel.c
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@ -157,7 +157,7 @@ static void __devinit init_intel(struct cpuinfo_x86 *c)
if ( p )
strcpy(c->x86_model_id, p);
c->x86_num_cores = num_cpu_cores(c);
c->x86_max_cores = num_cpu_cores(c);
detect_ht(c);