linux-kernel - Re: [PATCH v9 03/10] drm/sched: add device name to the drm_sched_process

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Message-ID: <aCtPbUaah-bmcEMk@pollux>
Date: Mon, 19 May 2025 17:34:05 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: Matthew Brost <matthew.brost@...el.com>,
	Philipp Stanner <phasta@...nel.org>,
	Christian König <ckoenig.leichtzumerken@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 03/10] drm/sched: add device name to the
 drm_sched_process_job event

On Thu, Apr 24, 2025 at 10:38:15AM +0200, Pierre-Eric Pelloux-Prayer wrote:
> diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> index f56e77e7f6d0..713df3516a17 100644
> --- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> +++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
> @@ -42,6 +42,7 @@ DECLARE_EVENT_CLASS(drm_sched_job,
>  			     __field(uint64_t, id)
>  			     __field(u32, job_count)
>  			     __field(int, hw_job_count)
> +			     __string(dev, dev_name(sched_job->sched->dev))

Using the sched_job->sched pointer here and in other trace events implies that
the trace event must not be called before the sched_job->sched has been set,
i.e. in drm_sched_job_arm().

Please document this for the corresponding trace events.