linux-kernel - Re: [PATCH v8 2/8] hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device

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Date:   Tue, 17 May 2022 17:15:07 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     John Garry <john.garry@...wei.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        <gregkh@...uxfoundation.org>, <alexander.shishkin@...ux.intel.com>,
        <leo.yan@...aro.org>, <james.clark@....com>, <will@...nel.org>,
        <robin.murphy@....com>, <acme@...nel.org>,
        <jonathan.cameron@...wei.com>
CC:     <helgaas@...nel.org>, <lorenzo.pieralisi@....com>,
        <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <mark.rutland@....com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <peterz@...radead.org>,
        <mingo@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-pci@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>, <prime.zeng@...wei.com>,
        <liuqi115@...wei.com>, <zhangshaokun@...ilicon.com>,
        <linuxarm@...wei.com>
Subject: Re: [PATCH v8 2/8] hwtracing: hisi_ptt: Add trace function support
 for HiSilicon PCIe Tune and Trace device

On 2022/5/17 16:21, John Garry wrote:
> On 17/05/2022 09:09, Yicong Yang wrote:
>>>> +    target = cpumask_any(cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev)));
>>>> +    if (target < nr_cpumask_bits) {
>>> the comment for cpumask_any() hints to check against nr_cpu_ids - any specific reason to check against nr_cpumask_bits?
>>>
>> here should be:
>>     if (target >= nr_cpumask_bits) {
>>
>> will fix this up.
>>
> 
> I am still not sure that using nr_cpumask_bits is correct.

Let's use nr_cpu_ids to match the comment of cpumask_any(). Actually we should have
nr_cpu_ids(possible cpus, init to NR_CPUS) <= nr_cpumask_bits (NR_CPUS) so it's ok here.