linux-kernel - Re: [PATCH 4/5] hwtracing: hisi_ptt: Don't try to attach a task

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Date:   Fri, 25 Aug 2023 12:25:16 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Yicong Yang <yangyicong@...wei.com>
CC:     <suzuki.poulose@....com>, <mathieu.poirier@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        <alexander.shishkin@...ux.intel.com>, <helgaas@...nel.org>,
        <linux-pci@...r.kernel.org>, <prime.zeng@...ilicon.com>,
        <linuxarm@...wei.com>, <yangyicong@...ilicon.com>,
        <hejunhao3@...wei.com>
Subject: Re: [PATCH 4/5] hwtracing: hisi_ptt: Don't try to attach a task

On Wed, 9 Aug 2023 16:18:24 +0800
Yicong Yang <yangyicong@...wei.com> wrote:

> From: Yicong Yang <yangyicong@...ilicon.com>
> 
> PTT is an uncore PMU and shouldn't be attached to any task. Block
> the usage in pmu::event_init().
> 
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>

Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/hwtracing/ptt/hisi_ptt.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
> index 3aba7bb6e548..916686c6a9c8 100644
> --- a/drivers/hwtracing/ptt/hisi_ptt.c
> +++ b/drivers/hwtracing/ptt/hisi_ptt.c
> @@ -1003,6 +1003,9 @@ static int hisi_ptt_pmu_event_init(struct perf_event *event)
>  		return -EOPNOTSUPP;
>  	}
>  
> +	if (event->attach_state & PERF_ATTACH_TASK)
> +		return -EOPNOTSUPP;
> +
>  	if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
>  		return -ENOENT;
>