+ ref_tracker-add-a-top-level-debugfs-directory-for-ref_tracker.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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The patch titled
     Subject: ref_tracker: add a top level debugfs directory for ref_tracker
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     ref_tracker-add-a-top-level-debugfs-directory-for-ref_tracker.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ref_tracker-add-a-top-level-debugfs-directory-for-ref_tracker.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Jeff Layton <jlayton@kernel.org>
Subject: ref_tracker: add a top level debugfs directory for ref_tracker
Date: Tue, 03 Jun 2025 07:27:13 -0400

Add a new "ref_tracker" directory in debugfs.  Each individual refcount
tracker can register files under there to display info about
currently-held references.

Link: https://lkml.kernel.org/r/20250603-reftrack-dbgfs-v13-2-7b2a425019d8@kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumaze <edumazet@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Jonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Kuniyuki Iwashima <kuniyu@amazon.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Qasim Ijaz <qasdev00@gmail.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Cc: Thomas Zimemrmann <tzimmermann@suse.de>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/ref_tracker.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/lib/ref_tracker.c~ref_tracker-add-a-top-level-debugfs-directory-for-ref_tracker
+++ a/lib/ref_tracker.c
@@ -273,3 +273,16 @@ int ref_tracker_free(struct ref_tracker_
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ref_tracker_free);
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+static struct dentry *ref_tracker_debug_dir = (struct dentry *)-ENOENT;
+
+static int __init ref_tracker_debugfs_init(void)
+{
+	ref_tracker_debug_dir = debugfs_create_dir("ref_tracker", NULL);
+	return 0;
+}
+late_initcall(ref_tracker_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */
_

Patches currently in -mm which might be from jlayton@kernel.org are

ref_tracker-dont-use-%pk-in-pr_ostream-output.patch
ref_tracker-add-a-top-level-debugfs-directory-for-ref_tracker.patch
ref_tracker-have-callers-pass-output-function-to-pr_ostream.patch
ref_tracker-add-a-static-classname-string-to-each-ref_tracker_dir.patch
ref_tracker-allow-pr_ostream-to-print-directly-to-a-seq_file.patch
ref_tracker-automatically-register-a-file-in-debugfs-for-a-ref_tracker_dir.patch
ref_tracker-add-a-way-to-create-a-symlink-to-the-ref_tracker_dir-debugfs-file.patch
net-add-symlinks-to-ref_tracker_dir-for-netns.patch
ref_tracker-eliminate-the-ref_tracker_dir-name-field.patch