RE: [PATCH] x86: Removing unnecessary check in detect_ht

Rao, Nikhil
2011-05-19T23:03:59Z

This patch removes a check that causes incorrect scheduler domain setup (SMP instead of SMT) and bootlog warning messages when cpuid extensions for topology enumeration are not supported and the number of processors reported to the OS is smaller than smp_num_siblings

Signed-off-by: Nikhil P Rao <nikhil.rao@intel.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
---
arch/x86/kernel/cpu/common.c | 7 -------
1 files changed, 0 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index cbc70a2..d2bcd54 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -477,13 +477,6 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
if (smp_num_siblings <= 1)
goto out;

- if (smp_num_siblings > nr_cpu_ids) {
- pr_warning("CPU: Unsupported number of siblings %d",
- smp_num_siblings);
- smp_num_siblings = 1;
- return;
- }
-
index_msb = get_count_order(smp_num_siblings);
c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid, index_msb);

--
1.7.4.2

> -----Original Message-----
> From: Ingo Molnar [mailto:mingo@elte.hu]
> Sent: Thursday, May 19, 2011 11:10 AM
> To: Rao, Nikhil
> Cc: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com;
> x86@kernel.org; Siddha, Suresh B; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] x86: Removing unnecessary check in detect_ht
>
> * Rao, Nikhil <nikhil.rao@intel.com> wrote:
>
> > Hi Ingo,
> >
> > Reposting as per your feedback.
>
> Please send a patch that applies to the x86 tree cleanly:
>
> http://people.redhat.com/mingo/tip.git/README
>
> Thanks,
>
> Ingo