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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=W+i8aZei; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (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 C65F5606F280; Wed, 4 Nov 2026 19:32:38 +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=W+i8aZei Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB97E1F000C1; Wed, 4 Nov 2026 19:32:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793820758; bh=z15Uq40RTWsSdyyx7OaN0bxQRP62XbWMWxAG8tgRqsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=W+i8aZeilfkPThwp9sk+IDIrcNh/6E37rCi1GakLs5JMOFkVQhVKQXkXobs0GsnmC X2w5aY+fCUKPZgFiwl4dmxwEoCZielH7nKgovpr50c7pO3XfdcFrRdLPMYF2xlbAAt 3UVMhfNaYBzloJyCglOGvkLp5sCBawqPIDZAtKLm0WKyQE4f6l0yJYPeQY/+q8lTkM ipCjS3tQRCG9VrAfpWvyxyu8TaSRCmQX1N+d54QbhsbTYJppG6u0WLdqkpyWUbQBdD EiU0Hqho5zULw8Z0FWgM9tiZsyw3bd5Ek++cBXgLUuSj9WX3ZVj0Iu1pCDoiiFv0xG RmpMBy6S0lbGg== From: Christian Brauner 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 Subject: [PATCH RESEND v2 13/23] proc: let procfs own the seq_file of /proc/stat Date: Wed, 4 Nov 2026 20:32:24 +0100 Message-ID: <20261104-work-procfs-core-v2-13-76ace653a773@kernel.org> In-Reply-To: <20261104-work-procfs-core-v2-0-76ace653a773@kernel.org> References: <20261104-work-procfs-core-v2-0-76ace653a773@kernel.org> X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1008; i=brauner@kernel.org; h=from:subject:message-id; bh=OV3IfsSeb+nM09t9wfnVIL5mmMQS24c4QneBQIUHStE=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9bm/Yo/Iod11QkuzuqU/SJ8a+PuXR6Rpmd3y9hLIR4 8bV+aILOkpZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACbiX8Lwh1uSjYHhJmd0rWVU E3PmDt25Vz5sTr9TsyfTrMdnXtVlWYa/4uuOXOpitsm4b1jxZ7NayJqeC7x8cvdK/pfvPcEslFf KDwA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit Declare the show function and let procfs open and free the seq_file. ->proc_open() only preallocates the buffer now. Signed-off-by: Christian Brauner (Amutable) --- fs/proc/stat.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/proc/stat.c b/fs/proc/stat.c index 79b42f2bfd00..3bfb79edc0f6 100644 --- a/fs/proc/stat.c +++ b/fs/proc/stat.c @@ -161,15 +161,13 @@ static int stat_open(struct inode *inode, struct file *file) /* minimum size to display an interrupt count : 2 bytes */ size += 2 * irq_get_nr_irqs(); - return single_open_size(file, show_stat, NULL, size); + return seq_preallocate(file->private_data, size); } static const struct proc_ops stat_proc_ops = { .proc_flags = PROC_ENTRY_PERMANENT, + .proc_show = show_stat, .proc_open = stat_open, - .proc_read_iter = seq_read_iter, - .proc_lseek = seq_lseek, - .proc_release = single_release, }; static int __init proc_stat_init(void) -- 2.53.0