From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B71A606A90E for ; Mon, 2 Nov 2026 15:23:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vyc0TIAk Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4jJFpx6y1Mz3dTC; Tue, 03 Nov 2026 02:23:53 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.234.252.31 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793633033; cv=none; b=FzQGRpbSwYzTISJ+zs0fX5WDC24QIhGOEQaYwVtWn3AlBMM5uNlLr4twtheUJnhEzqxQN5UJjQdbmXvYVPpCfi2v5XFPwD+209tWoeddwzFTwH5N+eY/0HnxUgKR0/1jDVf9nRqTnBEWZSJVqsLCzi/HMi45FHaUO9F9oWb40vmo+cwfNXMxaKiVAfsD7BwELf9vV1JHp8AgfM/id2ZuZMe/7fJSbZazisKpxW8jPVJABWq4U4TtWW8d5WwovwLLBSCrMRmA7kCp2rMgFG2mEnQ5yZGv1aRb4P0mufsNMfv7wChfjnI7IAwBWWT2itt1ZhiGsr6Np81XVoIJKIMtKQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793633033; c=relaxed/relaxed; bh=e6t+ZjLlcl2UBfeg6Fa8p1cvIAPOQLpJeTR6f8fh14w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PxhsRJAaT4hPdm08cNW+51P1rsAA7PkeNVx7jTZYVTChdMtLrEK8YHIcwxsRWPBDWqCUzBlYKxGiAQY7GSrTJ+NXW6xkydRwmxXmBcee67TcQi1aHsj3x3FYmrYmA2ssxKtiOK3+VCVeC83WloQb6JDHaT7gD0B+in3769wzCvlLAlmAur8mAEUHArf0cI1bDKigV8TD7phhqPQzwiAvi5UBEi+MD10+wYrx/oOPlnsIcynGxZDoiPsZNRBWJqJnebc3eTHfOEQoofATluyLZ0iSJAOIBIZJz2EmBAZcYAzk65tmXnY2+6fTXjZ0hL29fDAtgpcmHg1wnBnAxq8e6w== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vyc0TIAk; dkim-atps=neutral; spf=pass (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vyc0TIAk; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4jJFpx1kL5z3dSx for ; Tue, 03 Nov 2026 02:23:53 +1100 (AEDT) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id B983A41FB9; Mon, 2 Nov 2026 15:23:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31AFC1F00A17; Mon, 2 Nov 2026 15:23:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793633031; bh=e6t+ZjLlcl2UBfeg6Fa8p1cvIAPOQLpJeTR6f8fh14w=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Vyc0TIAkWtCaXuSIcqkzHLeKxyzrJXWfZdR7KJ6r92hFll9vSXVA6wBZRD3vYY+uB 3sZVdE2NFmTbgG2ddW0Dunqa+sx427e4/M6eCyX7YNulxzXA/Y7RrUt1CRtv0WV1c1 VnSdyrjZW1T7JnIrNFbHUTB5G0y2F7yNJ7aKsb2ZXNUPpTdBj7EAlKl0htLsJDFAU0 GwPSMja/JtXpY9i9oMZ1zVIV10/ZlPAajmqJjQDUDjAhADIX3yaC33ZI9nceLo+jVL nntEU+f/qQxM5Cqc+RfMImzf9pBGn9CnD6PB9Mfk8jOBpiv3i5NqevVbA17WMV+SOd Cvqc70uXuktPA== From: Christian Brauner Date: Mon, 02 Nov 2026 16:07:22 +0100 Subject: [PATCH RFC 12/27] locking/lockdep: let procfs own the seq_file of /proc/lock_stat X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-fs-v1-12-d09a996317b3@kernel.org> References: <20261102-work-procfs-fs-v1-0-d09a996317b3@kernel.org> In-Reply-To: <20261102-work-procfs-fs-v1-0-d09a996317b3@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=2606; i=brauner@kernel.org; h=from:subject:message-id; bh=wBxYZkbuLq2vx9tHnE9HzeQESu+Hnu4x6fVoBaGOq2s=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG4U7TXpwSSf2Lct89uWhW6YtPjWvccbVb/PU9T+v vr4N3Ez/Y5SFgYxLgZZMUUWh3aTcLnlPBWbjTI1YOawMoEMYeDiFICJeLkzMrw79v+ffdeGm4Jz BNPPLvqwVv2j7OqCSNWSaz/OrW1U/T6D4X/epKx5u14mSBWsvqm6pl/ZYFGsw6souyT3eiYxK2W lbj4A X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Declare the seq_operations and let procfs open and free the seq_file. ->proc_open() only takes the snapshot of the statistics now and ->proc_release() frees it. Signed-off-by: Christian Brauner (Amutable) --- kernel/locking/lockdep_proc.c | 48 +++++++++++++++++++------------------------ 1 file changed, 21 insertions(+), 27 deletions(-) diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c index 1916db9aa46b..9b034b5b94bd 100644 --- a/kernel/locking/lockdep_proc.c +++ b/kernel/locking/lockdep_proc.c @@ -638,40 +638,35 @@ static const struct seq_operations lockstat_ops = { .show = ls_show, }; +/* procfs opens the seq_file */ static int lock_stat_open(struct inode *inode, struct file *file) { - int res; - struct lock_class *class; struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); + struct lock_stat_data *iter; + struct seq_file *m = file->private_data; + struct lock_class *class; + unsigned long idx; if (!data) return -ENOMEM; - res = seq_open(file, &lockstat_ops); - if (!res) { - struct lock_stat_data *iter = data->stats; - struct seq_file *m = file->private_data; - unsigned long idx; - - iterate_lock_classes(idx, class) { - if (!test_bit(idx, lock_classes_in_use)) - continue; - iter->class = class; - lock_stats(class, &iter->stats); - iter++; - } - - data->iter_end = iter; + iter = data->stats; + iterate_lock_classes(idx, class) { + if (!test_bit(idx, lock_classes_in_use)) + continue; + iter->class = class; + lock_stats(class, &iter->stats); + iter++; + } - sort(data->stats, data->iter_end - data->stats, - sizeof(struct lock_stat_data), - lock_stat_cmp, NULL); + data->iter_end = iter; - m->private = data; - } else - vfree(data); + sort(data->stats, data->iter_end - data->stats, + sizeof(struct lock_stat_data), + lock_stat_cmp, NULL); - return res; + m->private = data; + return 0; } static ssize_t lock_stat_write(struct file *file, const char __user *buf, @@ -702,14 +697,13 @@ static int lock_stat_release(struct inode *inode, struct file *file) struct seq_file *seq = file->private_data; vfree(seq->private); - return seq_release(inode, file); + return 0; } static const struct proc_ops lock_stat_proc_ops = { + .proc_seq_ops = &lockstat_ops, .proc_open = lock_stat_open, .proc_write = lock_stat_write, - .proc_read = seq_read, - .proc_lseek = seq_lseek, .proc_release = lock_stat_release, }; #endif /* CONFIG_LOCK_STAT */ -- 2.53.0