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Wed, 4 Nov 2026 19:56:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793822221; bh=jhlUxShJ2PAnaFYEGZj/acNyvX4jU2/JMVjl8Ac9zMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UG/CjC9Rkt2XWe4Y5CTT/ADBXwDaw3htLjr8y5+YgL1YecUa9PaFlx8A+yiHz1SJ8 4p/C+A4TJyThvCbT9oVAs12xUwwZfi3gUSQHEi0+ktGxJApT9TgtkZ7MZMIQb0oT1t mimm0lfDVOWpZibb2krg3AKjfKsJ/2wyOhrIZ1/2EFinBMslTP/kS+IH84SFmYH5Eg VqKLbY/k2mFZzsyboc8nkysTN03ogqiKx7Z/2HJ+GsHFrCwFfcOgZMgTbzH7pQ/p84 YjMYmkTsQU68yWG3aWhGtTSWVEK+TsxCMKzZUGUkncRJtgioqc9ZXJzF76qWCzLVHP f0H0qGfmOj7IQ== 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 29/30] kernel/configs: let procfs copy out reads of /proc/config.gz Date: Wed, 4 Nov 2026 20:56:47 +0100 Message-ID: <20261104-work-procfs-fs-v2-29-319e0f9a8aae@kernel.org> In-Reply-To: <20261104-work-procfs-fs-v2-0-319e0f9a8aae@kernel.org> References: <20261104-work-procfs-fs-v2-0-319e0f9a8aae@kernel.org> 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" 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=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97vHLN0r7IJLRr5y0OmX5Xu/U5sWZHm3lBfWGUlk7h XyrbJ52lLIwiHExyIopsji0m4TLLeep2GyUqQEzh5UJZAgDF6cATMRJnZHhUPftBdnFb3hflihK zLy5v/jL7fC/i5gnv7e8XrfJi+OXEyPDxuIwjmsNi4T7HnqwOKu6dClZ31A1+vC+ycV1bYfyKy1 OAA== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit 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 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