Fix misreporting of #cores as #hyperthreads for Q9550

Fix misreporting of #cores as #hyperthreads for Q9550

Fix misreporting of #cores for the Intel Quad Core Q9550.

For the Q9550, in x86_64 mode, /proc/cpuinfo mistakenly
reports the #cores present as the #hyperthreads present.
i386 mode was not examined but is assumed to have the
same problem.

A backport of the following three 2.6.29-rc1 patches
fixes the problem:
  066941bd4eeb159307a5d7d795100d0887c00442:
    [PATCH] x86: unmask CPUID levels on Intel CPUs
  99fb4d349db7e7dacb2099c5cc320a9e2d31c1ef:
    [PATCH] x86: unmask CPUID levels on Intel CPUs, fix
  bdf21a49bab28f0d9613e8d8724ef9c9168b61b9:
    [PATCH] x86: add MSR_IA32_MISC_ENABLE bits to <asm/msr-index.h>

From the first patch: "If the CPUID limit bit in
MSR_IA32_MISC_ENABLE is set, clear it to make all CPUID
information available.  This is required for some features
to work, in particular XSAVE."

Originally-Developed-by: H. Peter Anvin <hpa@linux.intel.com>
Backported-by: Joe Korty <joe.korty@ccur.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>