linux-kernel - Re: [PATCH v4 00/10] tracing: introducing eventfs

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Date:   Fri, 21 Jul 2023 16:40:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     "shuah@...nel.org" <shuah@...nel.org>,
        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        Ching-lin Yu <chinglinyu@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, lkp@...el.com,
        Nadav Amit <namit@...are.com>, oe-lkp@...ts.linux.dev,
        Alexey Makhalov <amakhalov@...are.com>,
        "er.ajay.kaher@...il.com" <er.ajay.kaher@...il.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Tapas Kundu <tkundu@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>
Subject: Re: [PATCH v4 00/10] tracing: introducing eventfs

On Fri, 21 Jul 2023 09:19:47 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> > +	} else {
> > +		/* A race here, should try again (unless freed) */
> > +		invalidate = true;  
> 
> I had a WARN_ON() once here. Probably could add a:
> 
> 		WARN_ON_ONCE(!ef->is_freed);

Yeah this should have a WARN_ON_ONCE() because the only way to get here
with having a dentry and the ef->dentry being set is if we have two
dentries with the same name in the same directory. Which should never
happen.

I think we can add:

		/*
		 * Should never happen unless we get here due to being freed.
		 * Otherwise it means two dentries exist with the same name.
		 */
		WARN_ON_ONCE(!ef->is_freed);

> 
> > +	}


-- Steve