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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=LE2xhvlf; 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 C68E1606D83B; Wed, 4 Nov 2026 19:36:35 +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=LE2xhvlf Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC6AC1F00A17; Wed, 4 Nov 2026 19:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793820995; bh=pQQ1Vs9Ggdq4tGJpsZZ2KAKh5WKICEOKhSgV+25xKrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LE2xhvlfg0ggjtQBi7k/yBWe0FPcdQ+k5fjG+wAjpCj+7mLg+pQWGjB8uBtCBJNXU 1hm3hiNz0BzNx64SJ+0v+umYt/gvnmwmjNeM7eZmZjkMKK3r7ZsY2rCE/cB6Vuoyyh hIm4cNe2e5X+iWpnmRoQvIMbMtlTbV9ryhFiKp2B2qAh/B+heLylm9TXu09jUtvetc 89Djht6RVz/zMTf2pNKVsSpvsCd9UrC3EC7He4FCRXcjO86xQhz9K0fnAZaQmRvf1V LQvwsJ7brRbuX4lwrdJ3+wt3Lk3D3kEIgaBKvZYk9sv9eiUC/NwIjt9LAfL6Wez6nR 7HlhFAAkWGJPA== 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 03/23] ARM: atags: let procfs copy out reads of /proc/atags Date: Wed, 4 Nov 2026 20:36:21 +0100 Message-ID: <20261104-work-procfs-arch-v2-3-2aeb952c9597@kernel.org> In-Reply-To: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> References: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> X-Mailing-List: linux-fbdev@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=1063; i=brauner@kernel.org; h=from:subject:message-id; bh=T/gtJK8LVC1DZFUM73wYroC67tSKwFUXW93lvLyJ5ro=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97vgw51B0y7b3epsi2Y5kbPn1fPGCaewfFUu+1k53Z JidtfhtX0cpC4MYF4OsmCKLQ7tJuNxynorNRpkaMHNYmUCGMHBxCsBEOMsY/odG5F5OSDr8hjPk wnRp9d45CfqTm+89/PDpwqGEq92fBBoYGf4+yNE6FyxcodQt3qaa4nQ2ZtEpUeWA3P6OmgtKL/Z zswMA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit Implement ->proc_read_buf() so procfs copies what is read to userspace after it unpinned the entry. Signed-off-by: Christian Brauner (Amutable) --- arch/arm/kernel/atags_proc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/kernel/atags_proc.c b/arch/arm/kernel/atags_proc.c index 8411fbfbcb8b..ff28bf24dd30 100644 --- a/arch/arm/kernel/atags_proc.c +++ b/arch/arm/kernel/atags_proc.c @@ -10,15 +10,15 @@ struct buffer { char data[] __counted_by(size); }; -static ssize_t atags_read(struct file *file, char __user *buf, +static ssize_t atags_read(struct file *file, char *buf, size_t count, loff_t *ppos) { struct buffer *b = pde_data(file_inode(file)); - return simple_read_from_buffer(buf, count, ppos, b->data, b->size); + return memory_read_from_buffer(buf, count, ppos, b->data, b->size); } static const struct proc_ops atags_proc_ops = { - .proc_read = atags_read, + .proc_read_buf = atags_read, .proc_lseek = default_llseek, }; -- 2.53.0