linux-kernel - Re: [PATCH 5/6] eventfs: Add WARN_ON_ONCE() to checks in eventfs_root

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Date: Thu, 1 Feb 2024 12:23:45 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Christian Brauner
 <brauner@...nel.org>, Al Viro <viro@...IV.linux.org.uk>, Ajay Kaher
 <ajay.kaher@...adcom.com>
Subject: Re: [PATCH 5/6] eventfs: Add WARN_ON_ONCE() to checks in
 eventfs_root_lookup()

On Thu, 01 Feb 2024 10:34:51 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> --- a/fs/tracefs/event_inode.c
> +++ b/fs/tracefs/event_inode.c
> @@ -483,7 +483,7 @@ static struct dentry *eventfs_root_lookup(struct inode *dir,
>  	struct dentry *result = NULL;
>  
>  	ti = get_tracefs(dir);
> -	if (!(ti->flags & TRACEFS_EVENT_INODE))
> +	if (WARN_ON_ONCE!(ti->flags & TRACEFS_EVENT_INODE)))

I added this patch at the end but never tested it :-p

I then did a rebase to move it ahead of patch 6, which was tested.

Will resend this patch.

-- Steve


>  		return ERR_PTR(-EIO);
>  
>  	mutex_lock(&eventfs_mutex);