From nobody Wed Feb 11 04:01:04 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CC13233D9C; Thu, 29 May 2025 15:21:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748532090; cv=none; b=IrdHAAFt61ScVMnaWA1RbcKtpVmFGFv2m30Thgnh3cL/r/Bj92uHodsjdaWVnfK4B0VrMrTlsTby+QK64UXLdbCK9Wjgof6OBGKpc8MJGH1Mpyoq2pybK22l/FJKIZeoopvwmUpOlGNm1zugwmq1x9/idBrycbreBE0iYjHbge0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748532090; c=relaxed/simple; bh=TYdiGaavXoUhBEfyJ2tof4CzGHWJn078+gZ8gTQMfh4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qNBtrsxT08JI/NuwTVgcUpx7vsT1Br1ABuBtXDHqOj9C61Il6lwn23Lz9AG4VpyjsYVr2SmUQhAina09rW0f0e61MsopFmQB3cVLXIPxwEc99/4cFhIwp3WAGpYhcNgyMmwwE5msl93ACmP6fJaB0pzsL9Sdbutn3Xmp/rgu8SY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SSzdUfoO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SSzdUfoO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30090C4CEF1; Thu, 29 May 2025 15:21:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748532090; bh=TYdiGaavXoUhBEfyJ2tof4CzGHWJn078+gZ8gTQMfh4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=SSzdUfoOTKfagcpSWk8/saZ49LwK2g8CVmDSUgDAK2faZub3eaaVGSnGLBtNqKRnh 7RktK5Rp12TQVtFN3BXQmHvGL8rf0egwMC9qbthfQ+5YXH7U46QYqodFg5vdvaP1No zwYkUoDbLdm+a0Z3tB0W1ArgLOck+qcJbRxGBxbSYVRrYvb/CPlbEaeveUvQXY2IFs 7akbAsO3TU5HDV40Jg/LX9L5qJzIQ9f1ZbX/A+TU8DYCU7vQawW99CxpccBwQNi6jX dl7t4p6zTTGDP0goQl/bT1EveuBbEyg3NPnO2hXgBBadOj/bUi9iJK/IlpE2EHhsII /eXo+3vzhCgHQ== From: Jeff Layton Date: Thu, 29 May 2025 11:20:44 -0400 Subject: [PATCH v12 08/10] ref_tracker: add a way to create a symlink to the ref_tracker_dir debugfs file Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250529-reftrack-dbgfs-v12-8-11b93c0c0b6e@kernel.org> References: <20250529-reftrack-dbgfs-v12-0-11b93c0c0b6e@kernel.org> In-Reply-To: <20250529-reftrack-dbgfs-v12-0-11b93c0c0b6e@kernel.org> To: Andrew Morton , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin Cc: Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Jeff Layton X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3044; i=jlayton@kernel.org; h=from:subject:message-id; bh=TYdiGaavXoUhBEfyJ2tof4CzGHWJn078+gZ8gTQMfh4=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBoOHtnIA/msdeh0SYjk5pNmKitkc6lL1jlnNBjz XK+CBCnD6eJAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaDh7ZwAKCRAADmhBGVaC FfM7EADCnX8FNq0rJLAa/m5YacLEeBDeXnKOAOu1EUGd0x9Sc/13o3JV8v58xmiX/hggibKW4M1 RxSeS+FbqyzI8zlA6AtCy/jjs4AcDRohpOdVsfha8371KB4cSurv9GvREmdmRLGiJ48mcfpUi6R 4JCjgmNhXfSP72aCCZ4/RVz4ZWsZvcFVpIMRIxQHMnRN3D/51Q9wbCOifHnRm8rGGsY9fxMKSeJ S+iv0HK1QHDu82iehMPD1VNFQ2ef38ZZ/NCgSLZX3nKgU+FHpypPTemO3pUCZZ7oSwEw/uVcSvu 0+7U3s5rb3QkAxcgIeIAUJ8EDBOZ9aZnQ52Gy9ToJoGQX73TqeIDJfrG1HJe8bn4tAMrvifd+aw aVxRHTcMzKR7dEUwU3TBDaKNJX3DleEN2ikcFoDswZNJxitIK4E8z1KU8GROoMqyEYxspNnAeNI zCZAQrxsCoTD/2UJr3AlTeJ3ZURlc1khik4G1MQDzmfLxMe64T2oEITH9OBuKDq889bM+QdCpxE u2AWKsWEWAesDyUrPdBXef+N5OBeqFp79yl6Ktaylew3wcf6mGCnlf1yPoBba8fEiqXpEgzbLw4 XiIipF4V7DxMgJPT286+LIzZlEC34hbkAHT3i+rrXXCeVFsRQyH8AUaCpv1vdBn+46EHzbLXeFa xgj2Buo4+MijiSQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Add the ability for a subsystem to add a user-friendly symlink that points to a ref_tracker_dir's debugfs file. Signed-off-by: Jeff Layton --- include/linux/ref_tracker.h | 13 +++++++++++++ lib/ref_tracker.c | 22 ++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h index dd289fdda12b1a10197912f5796f97002e785aaf..ddc5a7b2bd84692bbc1e1ae6767= 4ec2c6857e1ec 100644 --- a/include/linux/ref_tracker.h +++ b/include/linux/ref_tracker.h @@ -22,6 +22,7 @@ struct ref_tracker_dir { const char *class; /* object classname */ #ifdef CONFIG_DEBUG_FS struct dentry *dentry; + struct dentry *symlink; #endif char name[32]; #endif @@ -32,6 +33,7 @@ struct ref_tracker_dir { #ifdef CONFIG_DEBUG_FS =20 void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir); +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...); =20 #else /* CONFIG_DEBUG_FS */ =20 @@ -39,6 +41,11 @@ static inline void ref_tracker_dir_debugfs(struct ref_tr= acker_dir *dir) { } =20 +static inline __ostream_printf +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...) +{ +} + #endif /* CONFIG_DEBUG_FS */ =20 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir, @@ -56,6 +63,7 @@ static inline void ref_tracker_dir_init(struct ref_tracke= r_dir *dir, dir->class =3D class; #ifdef CONFIG_DEBUG_FS dir->dentry =3D NULL; + dir->symlink =3D NULL; #endif strscpy(dir->name, name, sizeof(dir->name)); ref_tracker_dir_debugfs(dir); @@ -91,6 +99,11 @@ static inline void ref_tracker_dir_debugfs(struct ref_tr= acker_dir *dir) { } =20 +static inline __ostream_printf +void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt,= ...) +{ +} + static inline void ref_tracker_dir_exit(struct ref_tracker_dir *dir) { } diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c index aed35a898466888fcb4e4186774933f54793008a..d778820bea952d96c9a1c280dfd= 6531135bd85e0 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -384,8 +384,30 @@ void ref_tracker_dir_debugfs(struct ref_tracker_dir *d= ir) } EXPORT_SYMBOL(ref_tracker_dir_debugfs); =20 +void __ostream_printf ref_tracker_dir_symlink(struct ref_tracker_dir *dir,= const char *fmt, ...) +{ + char name[NAME_MAX + 1]; + va_list args; + int ret; + + /* Already created, or dentry doesn't exist? Do nothing */ + if (!IS_ERR_OR_NULL(dir->symlink) || IS_ERR_OR_NULL(dir->dentry)) + return; + + va_start(args, fmt); + ret =3D vsnprintf(name, sizeof(name), fmt, args); + va_end(args); + name[sizeof(name) - 1] =3D '\0'; + + if (ret < sizeof(name)) + dir->symlink =3D debugfs_create_symlink(name, ref_tracker_debug_dir, + dir->dentry->d_name.name); +} +EXPORT_SYMBOL(ref_tracker_dir_symlink); + static void ref_tracker_debugfs_remove(struct ref_tracker_dir *dir) { + debugfs_remove(dir->symlink); debugfs_remove(dir->dentry); } =20 --=20 2.49.0