linux-kernel - Re: [PATCH] tracing/timerlat: Move hrtimer_init to timerlat

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Message-ID: <2024020109-duffel-finally-4f0b@gregkh>
Date: Thu, 1 Feb 2024 07:44:31 -0800
From: Greg KH <gregkh@...uxfoundation.org>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] tracing/timerlat: Move hrtimer_init to timerlat_fd open()

On Thu, Feb 01, 2024 at 04:13:39PM +0100, Daniel Bristot de Oliveira wrote:
> Currently, the timerlat's hrtimer is initialized at the first read of
> timerlat_fd, and destroyed at close(). It works, but it causes an error
> if the user program open() and close() the file without reading.

What error exactly happens?  Userspace, or the kernel crashes?

thanks,

greg k-h