From: Jeff Layton <jlayton@kernel.org>
Date: Wed, 18 Jun 2025 14:24:15 +0000 (-0400)
Subject: ref_tracker: add a top level debugfs directory for ref_tracker
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e209f9193a4724c1d4bc0b155c7beb78aa5d2928;p=thirdparty%2Flinux.git

ref_tracker: add a top level debugfs directory for ref_tracker

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

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20250618-reftrack-dbgfs-v15-2-24fc37ead144@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c
index de71439e12a3b..d374e5273e149 100644
--- a/lib/ref_tracker.c
+++ b/lib/ref_tracker.c
@@ -273,3 +273,16 @@ int ref_tracker_free(struct ref_tracker_dir *dir,
 	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 */