From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793631880; b=Ndbqe+38B497pyLmehcVhMY/NcQKSIgh4xSpu18qUzsn2Q6KShWIxzQoEP3hWFw4FWwL rUximyxAcb+5KBky7QdQXCZVvaatDwImw0RFV0/aTQ4treq3dlCXJbC3Am/WBD9gloWlo YQ4bSW6Nem/DwiAq5y6XI0NV6uQ2WOnl3gqhmONSoKSGJIy2jJ9usaS3VaHu7/AQxynWG 7T22+CuUcnN4NGI3KyJgz5xFQTRlJucVSaYnp6gJyz7MvCM2xDfOEAjfjlLSzotlMHY3n RblfqrUVuhPpycxYpi8VPiG5dZarCE79tTjRFmjNUCKotmKggSjIuaclFgZgwVa+Pkg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793631880; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer; bh=moTp49XZfW2IxIkO6/t4/a2jJtvDF10yNUa6q6hnE3E=; b=Z4BL/wNiGb8QQKtF1hjJNDyfrFsx1CY8rlHPXGQebvTS8WAeWlzO53Akjy0LYWY2bLVf 9DcedJumRgBOLu9waa3is4CevYnnHpVuTnhKq3VwMhyzubHfF1KdUKlFHYr3uV997M4MS 5ac5W7UmvtQjeCAjiIDNai6AYneUFipkWBoQeNN9KPv0A9p5AfdiiurXxz+Usw9a5cKGA 5sWSOiOeoIz8LGklS3HaYbuGZ+HVP6P5BuM0nhlNjYyP3VoxEsdId6vXK+Uga2032dwiE TqFAPfyWPdLGUXYnfkt/KdfTIF/wfe9WXWtyd+ZQ9Jt/ehMyo6TfwOVP40XEqZycH6w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=IiiIdQDE; 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 64A8F6085096; Mon, 2 Nov 2026 15:04:40 +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=IiiIdQDE Received: by smtp.kernel.org (Postfix) with ESMTPSA id 271441F00A1A; Mon, 2 Nov 2026 15:04:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793631880; bh=moTp49XZfW2IxIkO6/t4/a2jJtvDF10yNUa6q6hnE3E=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=IiiIdQDEZtu3zrQxqnMzxL+byWk/RAlCN8/hC422DxTxacxYbFQWlllhBgr+wCmCQ o9JOkaQkWd0AQIOfZ2O+qkAIOysyokSE2fcTak2VdOZoJKRHLA0f+7hXRqhPBAMdky vgWDoWlfqaLnAWRNoKk8RC6jFoyccCUDgzz/C6H/mIYktv6mCSN/TWi3bYAQ7NRiTd 5S25YeBcc3fgExVmao12q8Y5BebuiNbZn+zxcQiNl93jyDgvg9mLGIhUCHtUIS5ANV /YEQs36+1Zxizq9lsuD1fhZ94uGyuaO2p6IZK+qsp1AhT+1p7srUwebEMTN+HJIWDu Gdu23GXfY3v+w== From: Christian Brauner Date: Mon, 02 Nov 2026 16:01:36 +0100 Subject: [PATCH RFC 09/22] sh: alignment: let procfs copy in writes 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" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-arch-v1-9-c9492ab08480@kernel.org> References: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> In-Reply-To: <20261102-work-procfs-arch-v1-0-c9492ab08480@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 Implement ->proc_write_buf() so procfs copies in what is written to the alignment files before it pins the entry, and take the mode from that copy. Writes larger than PAGE_SIZE - 1 bytes fail with -EINVAL now. Signed-off-by: Christian Brauner (Amutable) --- arch/sh/mm/alignment.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/sh/mm/alignment.c b/arch/sh/mm/alignment.c index 2198c6f2ea63..d832249a8e18 100644 --- a/arch/sh/mm/alignment.c +++ b/arch/sh/mm/alignment.c @@ -133,14 +133,13 @@ static int alignment_proc_show(struct seq_file *m, void *v) } static ssize_t alignment_proc_write(struct file *file, - const char __user *buffer, size_t count, loff_t *pos) + char *buffer, size_t count, loff_t *pos) { int *data = pde_data(file_inode(file)); char mode; if (count > 0) { - if (get_user(mode, buffer)) - return -EFAULT; + mode = buffer[0]; if (mode >= '0' && mode <= '5') *data = mode - '0'; } @@ -149,7 +148,7 @@ static ssize_t alignment_proc_write(struct file *file, static const struct proc_ops alignment_proc_ops = { .proc_show = alignment_proc_show, - .proc_write = alignment_proc_write, + .proc_write_buf = alignment_proc_write, }; /* -- 2.53.0