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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 <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Siddha, Suresh B 2005-11-05 17:25:54 +01:00 • committed by Linus Torvalds
commit 94605eff57
11 changed files with 178 additions and 110 deletions
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4
include/asm-i386/processor.h
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@ -65,7 +65,9 @@ struct cpuinfo_x86 {
int f00f_bug;
int coma_bug;
unsigned long loops_per_jiffy;
unsigned char x86_num_cores;
unsigned char x86_max_cores; /* cpuid returned max cores value */
unsigned char booted_cores; /* number of cores as seen by OS */
unsigned char apicid;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define X86_VENDOR_INTEL 0