From: Zhang Rui <rui.zhang@intel.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
linux-hwmon@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
hpa@zytor.com, corbet@lwn.net, fenghua.yu@intel.com,
jdelvare@suse.com, linux@roeck-us.net, len.brown@intel.com
Subject: Re: [PATCH 7/7] perf/x86/intel/P4: Fix smp_num_siblings usage
Date: Sun, 14 Aug 2022 01:29:31 +0800 [thread overview]
Message-ID: <132858ae66f1cffeb32cc39b788647f52957fd5e.camel@intel.com> (raw)
In-Reply-To: <YveCBx/X/YyoccI0@gmail.com>
Hi, Ingo,
On Sat, 2022-08-13 at 12:50 +0200, Ingo Molnar wrote:
>
> * Zhang Rui <rui.zhang@intel.com> wrote:
>
> > smp_num_siblings can be larger than 2.
> >
> > Any value larger than 1 suggests HT is supported.
> >
> > Reviewed-by: Len Brown <len.brown@intel.com>
> > Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> > ---
> > arch/x86/include/asm/perf_event_p4.h | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/include/asm/perf_event_p4.h
> > b/arch/x86/include/asm/perf_event_p4.h
> > index 94de1a05aeba..b14e9a20a7c0 100644
> > --- a/arch/x86/include/asm/perf_event_p4.h
> > +++ b/arch/x86/include/asm/perf_event_p4.h
> > @@ -189,7 +189,7 @@ static inline int p4_ht_active(void)
> > static inline int p4_ht_thread(int cpu)
> > {
> > #ifdef CONFIG_SMP
> > - if (smp_num_siblings == 2)
> > + if (smp_num_siblings > 1)
> > return cpu !=
> > cpumask_first(this_cpu_cpumask_var_ptr(cpu_sibling_map));
>
> This fix too should probably come before all the other changes.
>
> (Not that Pentium 4 code is expected to ever see such SMT thread
> values.)
>
Do you mean that this is a clean fix, and there is no reason for this
patch to be blocked by any of the other patches in this series?
thanks,
rui
next prev parent reply other threads:[~2022-08-13 17:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-12 16:41 [PATCH 0/7] x86/topology: Improve CPUID.1F handling Zhang Rui
2022-08-12 16:41 ` [PATCH 1/7] x86/topology: Fix multiple packages shown on a single-package system Zhang Rui
2022-08-12 16:41 ` [PATCH 2/7] x86/topology: Fix duplicated core_id within a package Zhang Rui
2022-08-12 16:41 ` [PATCH 3/7] hwmon/coretemp: Handle large core id value Zhang Rui
2022-08-12 17:16 ` Guenter Roeck
2022-08-13 17:24 ` Zhang Rui
2022-08-13 10:48 ` Ingo Molnar
2022-08-13 17:07 ` Zhang Rui
2022-08-14 9:12 ` Ingo Molnar
2022-08-12 16:41 ` [PATCH 4/7] x86/topology: Fix max_siblings calculation Zhang Rui
2022-08-12 16:41 ` [PATCH 5/7] Documentation: x86: Update smp_num_siblings/x86_max_cores description Zhang Rui
2022-08-12 16:41 ` [PATCH 6/7] Documentation: x86: Remove obsolete x86_max_dies description Zhang Rui
2022-08-12 16:41 ` [PATCH 7/7] perf/x86/intel/P4: Fix smp_num_siblings usage Zhang Rui
2022-08-13 10:50 ` Ingo Molnar
2022-08-13 17:29 ` Zhang Rui [this message]
2022-08-15 9:11 ` Peter Zijlstra
2022-08-16 2:26 ` Zhang Rui
2022-08-16 8:26 ` Peter Zijlstra
2022-08-13 10:44 ` [PATCH 0/7] x86/topology: Improve CPUID.1F handling Ingo Molnar
2022-08-13 17:10 ` Zhang Rui
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