Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <40f03ea6-1690-8a6f-2969-24c47f39c215@huawei.com>
Date:   Thu, 14 Apr 2022 14:00:44 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.6.1
Subject: Re: [PATCH v7 5/7] perf tool: Add support for HiSilicon PCIe Tune and
 Trace device driver
To:     Yicong Yang <yangyicong@huawei.com>,
        Yicong Yang <yangyicong@hisilicon.com>,
        <gregkh@linuxfoundation.org>, <helgaas@kernel.org>,
        <alexander.shishkin@linux.intel.com>, <lorenzo.pieralisi@arm.com>,
        <will@kernel.org>, <mark.rutland@arm.com>,
        <mathieu.poirier@linaro.org>, <suzuki.poulose@arm.com>,
        <mike.leach@linaro.org>, <leo.yan@linaro.org>,
        <jonathan.cameron@huawei.com>, <daniel.thompson@linaro.org>,
        <joro@8bytes.org>, <shameerali.kolothum.thodi@huawei.com>,
        <robin.murphy@arm.com>, <peterz@infradead.org>, <mingo@redhat.com>,
        <acme@kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <coresight@lists.linaro.org>, <linux-pci@vger.kernel.org>,
        <linux-perf-users@vger.kernel.org>,
        <iommu@lists.linux-foundation.org>
CC:     <prime.zeng@huawei.com>, <liuqi115@huawei.com>,
        <zhangshaokun@hisilicon.com>, <linuxarm@huawei.com>
References: <20220407125841.3678-1-yangyicong@hisilicon.com>
 <20220407125841.3678-6-yangyicong@hisilicon.com>
 <276c24d2-daf5-5eba-26b9-55edd4a45537@huawei.com>
 <e2b7484b-eb15-029c-b1e1-4831368f61c9@huawei.com>
From:   John Garry <john.garry@huawei.com>
In-Reply-To: <e2b7484b-eb15-029c-b1e1-4831368f61c9@huawei.com>
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

On 12/04/2022 08:41, Yicong Yang wrote:
>>> +    hisi_ptt_pmus = zalloc(sizeof(struct perf_pmu *) * (*nr_ptts));
>>> +    if (!hisi_ptt_pmus) {
>>> +        pr_err("hisi_ptt alloc failed\n");
>>> +        *err = -ENOMEM;
>> using PTR_ERR seems better, if possible
>>
> ok will change to that. *err = -ENOMEM is used here to keep consistence with
> what spe does.
> 

Ah, I see that we are contrained by the interface of 
auxtrace_record_init() to pass err as a pointer, so I suppose the code 
in this patch is ok to fit into that.