linux-kernel - Re: [PATCH] perf/x86/intel/uncore: don't use smp_processor_id() in validate

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Date:	Thu, 19 Sep 2013 22:27:50 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf/x86/intel/uncore: don't use smp_processor_id() in validate_group()

On Wed, Sep 18, 2013 at 5:31 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Sep 17, 2013 at 02:48:13PM +0800, Yan, Zheng wrote:
>> From: "Yan, Zheng" <zheng.z.yan@...el.com>
>>
>> uncore_validate_group() can't call smp_processor_id() because it is
>> in preemptible context. Pass NUMA_NO_NODE to the allocator instead.
>>
>> Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>
>> ---
>>  arch/x86/kernel/cpu/perf_event_intel_uncore.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> index fd8011e..11b1582 100644
>> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
>> @@ -3031,7 +3031,7 @@ static int uncore_validate_group(struct intel_uncore_pmu *pmu,
>>       struct intel_uncore_box *fake_box;
>>       int ret = -EINVAL, n;
>>
>> -     fake_box = uncore_alloc_box(pmu->type, smp_processor_id());
>> +     fake_box = uncore_alloc_box(pmu->type, NUMA_NO_NODE);
>
> Doesn't work since you're passing cpu, not node.
>
> I changed it to the below. However upon doing so I noticed you
> hard coded PCI devices live on Node0, this is not true in general
> (although likely true for tiny systems).
>
> I've absolutely no clue about the entire PCI layer, but it would be nice
> if there's a method to extract the local node of a pci device.
>
> Bjorn is there such a thing?

dev_to_node(&pdev->dev), as in pci_call_probe()?
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