linux-kernel - Re: [PATCH v9 00/10] ref_tracker: add ability to register a debugfs file for a ref_tracker

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Message-ID: <dd6d7bab06000e50758d15b5a4712f2472e98a9b.camel@kernel.org>
Date: Sat, 10 May 2025 07:17:35 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, "David S. Miller"	
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni	
 <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 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>, Jani Nikula	
 <jani.nikula@...ux.intel.com>, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>,  Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tursulin@...ulin.net>, Kuniyuki Iwashima	
 <kuniyu@...zon.com>, Qasim Ijaz <qasdev00@...il.com>, Nathan Chancellor	
 <nathan@...nel.org>, Andrew Lunn <andrew@...n.ch>,
 linux-kernel@...r.kernel.org, 	netdev@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, 	intel-gfx@...ts.freedesktop.org, Thomas
 Weißschuh	 <thomas.weissschuh@...utronix.de>, Jani
 Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v9 00/10] ref_tracker: add ability to register a debugfs
 file for a ref_tracker_dir

On Fri, 2025-05-09 at 16:00 -0700, Jakub Kicinski wrote:
> On Fri, 09 May 2025 11:53:36 -0400 Jeff Layton wrote:
> > This one just fixes a typo in the ref_tracker_dir_init() kerneldoc
> > header. I'm only resending so the CI will pick it up.
> 
> We got a bunch of:
> 
> [    0.457561][    T0] ref_tracker: ref_tracker: unable to create debugfs file for net_refcnt@...fffff92da4870: -ENOENT
> [    0.457561][    T0] ref_tracker: ref_tracker: unable to create debugfs file for net_notrefcnt@...fffff92da48f8: -ENOENT
> 
> [    0.973191][    T1] ref_tracker: ref_tracker: unable to create debugfs file for netdev@...f888004d0c5a8: -ENOENT
> 
> [    1.150784][    T1] ref_tracker: ref_tracker: unable to create debugfs file for netdev@...f8880053fc5a8: -ENOENT
> 
> [    1.660680][    T1] ref_tracker: ref_tracker: unable to create debugfs file for netdev@...f8880085f95a8: -ENOENT
> 
> in the CI at boot. Presumably init_net and loopback.
> 
> https://netdev-3.bots.linux.dev/vmksft-net-drv-dbg/results/113741/vm-start-thr0-0/stdout

Makes sense. I had an earlier version that only attempted to create the
debugfs file if the directory was already created, but Andrew had
complained about the error checking I was doing on debugfs. That would
silence these warnings. I'll see about bringing that back.

-- 
Jeff Layton <jlayton@...nel.org>