Messages in this thread Patch in this message | | | Date | Thu, 18 Nov 2010 14:39:40 +0100 | From | Andi Kleen <> | Subject | Re: [PATCH 1/4] x86: set cpu masks before calling CPU_STARTING notifiers |
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On Thu, Nov 18, 2010 at 12:52:33PM +0100, Thomas Gleixner wrote: > On Thu, 18 Nov 2010, Andi Kleen wrote: > > > From: Andi Kleen <ak@linux.intel.com> > > > > When booting up a CPU set the various topology masks before > > calling the CPU_STARTING notifier. This way the notifier > > can actually use the masks. > > > > This is needed for a perf change. > > > > Signed-off-by: Andi Kleen <ak@linux.intel.com> > > --- > > arch/x86/kernel/smpboot.c | 8 ++++---- > > 1 files changed, 4 insertions(+), 4 deletions(-) > > > > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c > > index 083e99d..9d2980e 100644 > > --- a/arch/x86/kernel/smpboot.c > > +++ b/arch/x86/kernel/smpboot.c > > @@ -281,6 +281,10 @@ static void __cpuinit smp_callin(void) > > */ > > smp_store_cpu_info(cpuid); > > > > + /* This must be done before setting cpu_online_mask */ > > Can we please fix up that comment to match that change ?
Here's an updated patch.
x86: set cpu masks before calling CPU_STARTING notifiers
When booting up a CPU set the various topology masks before calling the CPU_STARTING notifier. This way the notifier can actually use the masks.
This is needed for a perf change.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 083e99d..c019c03 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -281,6 +281,13 @@ static void __cpuinit smp_callin(void) */ smp_store_cpu_info(cpuid); + /* + * This must be done before setting cpu_online_mask + * or calling notify_cpu_starting. + */ + set_cpu_sibling_map(raw_smp_processor_id()); + wmb(); + notify_cpu_starting(cpuid); /* @@ -322,10 +329,6 @@ notrace static void __cpuinit start_secondary(void *unused) legacy_pic->unmask(0); } - /* This must be done before setting cpu_online_mask */ - set_cpu_sibling_map(raw_smp_processor_id()); - wmb(); - /* * We need to hold call_lock, so there is no inconsistency * between the time smp_call_function() determines number of
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