From nobody Mon Feb 9 15:09:57 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 8E848289E2E; Wed, 7 May 2025 13:07:06 +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=1746623226; cv=none; b=ptCFBimffxKxQ/eACTYr+5Psf/bpvRVWjgF5Y/elV9D7Px7L0mHFVKmwg1BuvYUN/0WQVS1cP0AAZ9fBTVX67yPeqsgL3r7MWG+aVSOIwR+RWETS5AcNP2Wj/v9BJMKoW2FRTplVmyTKjMVmDe5dk4ZhAlDSPwh47XVwCoyu+MI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746623226; c=relaxed/simple; bh=G4yxeje4skzZFbWd4GKautKhwMx5ZwXU4VPyyJVpR7k=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=RILcLr8G1EJpZO9tQzauwmjz/ki5YXEGObhhSRc1WhMFrqvlo5RxtOPXhEFqDGgUhIZ2giqdurdkJ5Shd0VLqt7u3qPdFQ357zxDnsUWQ8rsRRAMqtukxOlzsYcmkX6QIQOF8Y+Z3/An1Ws4+xYbthYM2kxtt9uyy6/43a/82oE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=t3PCvJ1M; 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="t3PCvJ1M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A33C6C4CEF3; Wed, 7 May 2025 13:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746623226; bh=G4yxeje4skzZFbWd4GKautKhwMx5ZwXU4VPyyJVpR7k=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=t3PCvJ1MjQWHoHr8rcY1szAUqxeBgbXiuAL1OIT8maJxLGNQbEMgm2DaCy+/i4O0l JAppUkNSvJx9NeVMXj4CsxAds5llgmcMdJvhfeTlu4Na2HPDWROrq8oQF53ncAKEM6 ii6cFIyyy7X3xT+7MVn0qoRzmYWs+NZIxuxrAXYJ/a9uzSbeg3CTOSiotWa9S4rL4G ihEi+s1MpVE/VWtAHSh4POoqUphAG3quijYfs1hHg8P1U91MmeCSxcs6ffKaniBCYy W5Xw6dCMCjXAeV8LG/tVoZV44PCyVvwlvfiq9CfgDVAfHZx2C2lBPbdPihs2ZNZa36 eBdzJKH/pRuoA== From: Jeff Layton Date: Wed, 07 May 2025 09:06:32 -0400 Subject: [PATCH v8 07/10] 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: <20250507-reftrack-dbgfs-v8-7-607717d3bb98@kernel.org> References: <20250507-reftrack-dbgfs-v8-0-607717d3bb98@kernel.org> In-Reply-To: <20250507-reftrack-dbgfs-v8-0-607717d3bb98@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=3234; i=jlayton@kernel.org; h=from:subject:message-id; bh=G4yxeje4skzZFbWd4GKautKhwMx5ZwXU4VPyyJVpR7k=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBoG1rpNCKf4YsMQbfK8sCDrPcx8y64dozFIWGHF 51xZx/6/0qJAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaBta6QAKCRAADmhBGVaC FfGHEADFNJlG9mOw4sk3p/gIAK2iEVfgZGxxN4uSWxWAs0FRQlqwVpfDmHS1luz5RZNEvXz3j4K EIyP1LexlPBoaaBMZ8gUYaUdO6NAAFA1M9HGcnLFN1QpOUJy2w6W7brMQ85ZnXMIRQOY8qoNaLU qydiwKtT0F5C6r37WOk+J2GA1pqghmvifgNQuBFFEW0BDk0qP7Xme8k3CflAMZB3TNpche1sEGi ol+VpRqpaO7C+iYWQwaXKfYFibA5h1BZGWF0y9RXq58yJYlb5dKuvoj858qL3Ot1bO8rJsyU42i NI07pdIXTnT+LAUB/11YhgrMa22Qj9W9eyRyPDOYslXqZkjQrkkb7bZtmbqIyD2Uz7n/K76ZCi6 Xgp9kqcOx83Dxw43RtGRjko1yNA+kTT5MJtjbIGqODxHlbJvXlhhBnBGPjQRI+SEGsFMwWKcN9y BE5iH5hA4+c1Acyd9RRCWsLNYvQkqvdTpiAT+iYF7twk5tLGpJm7fIK2nhBgMql/9l/ndUgQoaB J+aZ2tPuUMlkY3nlzEH5r7VsxCyi/kY5Guys5wDzOTUPHqwOVagjhUr7zgNykpAv6k6xSdQVWWT z/h/qGy/QTfg/u4pzTD5vSv+bBAIj3RZNCp7zdYNgwuJRYym6Z7I1lsikk1n0ozKNjlT0Mk9iac U8uubKn//wfAQtA== 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 | 28 ++++++++++++++++++++++++++++ 2 files changed, 41 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 1df12625d80cc7cff65d9f6be89e1dd5c5ffb7f6..5e84e5fd78e147a036d4adb511e= 657da07866a55 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -390,8 +390,36 @@ 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); + else + dir->symlink =3D ERR_PTR(-ENAMETOOLONG); + + if (IS_ERR(dir->symlink)) + pr_warn("ref_tracker: unable to create debugfs symlink for %s: %pe\n", + name, dir->symlink); +} +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