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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=bEpjay2C; 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 1C386609CDBF; Mon, 2 Nov 2026 15:29:23 +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=bEpjay2C Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8429A1F00A17; Mon, 2 Nov 2026 15:29:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793633363; bh=jhlUxShJ2PAnaFYEGZj/acNyvX4jU2/JMVjl8Ac9zMQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=bEpjay2CbnfGJBHly978mQVKfOK9NOWk818hauqaL6bJ1R9S6y4K750VMrYinkjRZ UJYMQ5lPJt9EqbCkMQJHIEzuAVhA0uBBsY3SQ52htvtKFFvqoAARzwAqIQhqo0yDks 27SjH2upRcJP3c6/Pe085axMXe6Pi9Arnrh7pZAVs3x5e/XE9jaVeyQ0qsr8Qkyfkq yc1WiGpYMVgd0fNpip1lkFOhbQga6TG73wT6BHy5m4PYoCpETxzGPsM53biago4TWh aXiE38bqIKzr3MTvUNm540DqItq0eT865nVxWPsH4BWXKPHJwP7owlsDAuHhhrBWTO HoE9gxpbWNrtQ== From: Christian Brauner Date: Mon, 02 Nov 2026 16:07:36 +0100 Subject: [PATCH RFC 26/27] kernel/configs: let procfs copy out reads of /proc/config.gz 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-fs-v1-26-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=1297; i=brauner@kernel.org; h=from:subject:message-id; bh=IZ5Jauw3jeCJbbKJV7DoExBPgNJSSia5o6c0KJSA0oY=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG68W/dM+SnW3p+PHz9Nr9SdtujbqdmGuR8kWUNv6 Ra5lWq6dpSyMIhxMciKKbI4tJuEyy3nqdhslKkBM4eVCWQIAxenAEzk9kRGhpbCF9v7uDqqLS5v Fwy4tydWj4HvRde9J5lu+/I9+Jmacxj+ijqWtebXBD78UxAm+sZz3pqzV2uF96jusDvBcuLcpOk H+QA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Implement ->proc_read_buf() so procfs copies what is read to userspace after it unpinned the entry. Unloading configs.ko then no longer waits for a reader that faults on its buffer. /proc/config.gz asks for PROC_ENTRY_FULL_READS so that reading all of it at once keeps working. Signed-off-by: Christian Brauner (Amutable) --- kernel/configs.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/configs.c b/kernel/configs.c index a28c79c5f713..05b12c440168 100644 --- a/kernel/configs.c +++ b/kernel/configs.c @@ -38,17 +38,18 @@ extern char kernel_config_data; extern char kernel_config_data_end; static ssize_t -ikconfig_read_current(struct file *file, char __user *buf, +ikconfig_read_current(struct file *file, char *buf, size_t len, loff_t * offset) { - return simple_read_from_buffer(buf, len, offset, + return memory_read_from_buffer(buf, len, offset, &kernel_config_data, &kernel_config_data_end - &kernel_config_data); } static const struct proc_ops config_gz_proc_ops = { - .proc_read = ikconfig_read_current, + .proc_flags = PROC_ENTRY_FULL_READS, + .proc_read_buf = ikconfig_read_current, .proc_lseek = default_llseek, }; -- 2.53.0