From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758176Ab0CBX4l (ORCPT ); Tue, 2 Mar 2010 18:56:41 -0500 Received: from kroah.org ([198.145.64.141]:38537 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752657Ab0CBX3V (ORCPT ); Tue, 2 Mar 2010 18:29:21 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Kay Sievers , Greg Kroah-Hartman Subject: [PATCH 19/62] Driver-Core: devtmpfs - remove EXPERIMENTAL and enable it by default Date: Tue, 2 Mar 2010 15:28:18 -0800 Message-Id: <1267572541-410-19-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.7.0.1 In-Reply-To: <20100302230933.GA32287@kroah.com> References: <20100302230933.GA32287@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kay Sievers All major distros enable devtmpfs on recent systems, so remove the EXPERIMENTAL flag, and enable it by default to reflect how it is used today. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/Kconfig | 45 ++++++++++++++++++++++++++++----------------- 1 files changed, 28 insertions(+), 17 deletions(-) diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index ee37727..8497ce9 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -9,29 +9,40 @@ config UEVENT_HELPER_PATH every uevent. config DEVTMPFS - bool "Create a kernel maintained /dev tmpfs (EXPERIMENTAL)" + bool "Maintain a devtmpfs filesystem to mount at /dev" depends on HOTPLUG && SHMEM && TMPFS + default y help - This creates a tmpfs filesystem, and mounts it at bootup - and mounts it at /dev. The kernel driver core creates device - nodes for all registered devices in that filesystem. All device - nodes are owned by root and have the default mode of 0600. - Userspace can add and delete the nodes as needed. This is - intended to simplify bootup, and make it possible to delay - the initial coldplug at bootup done by udev in userspace. - It should also provide a simpler way for rescue systems - to bring up a kernel with dynamic major/minor numbers. - Meaningful symlinks, permissions and device ownership must - still be handled by userspace. - If unsure, say N here. + This creates a tmpfs filesystem instance early at bootup. + In this filesystem, the kernel driver core maintains device + nodes with their default names and permissions for all + registered devices with an assigned major/minor number. + Userspace can modify the filesystem content as needed, add + symlinks, and apply needed permissions. + It provides a fully functional /dev directory, where usually + udev runs on top, managing permissions and adding meaningful + symlinks. + In very limited environments, it may provide a sufficient + functional /dev without any further help. It also allows simple + rescue systems, and reliably handles dynamic major/minor numbers. + If unsure, say Y here. config DEVTMPFS_MOUNT - bool "Automount devtmpfs at /dev" + bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" depends on DEVTMPFS + default y help - This will mount devtmpfs at /dev if the kernel mounts the root - filesystem. It will not affect initramfs based mounting. - If unsure, say N here. + This will instruct the kernel to automatically mount the + devtmpfs filesystem at /dev, directly after the kernel has + mounted the root filesystem. The behavior can be overridden + with the commandline parameter: devtmpfs.mount=0|1. + This option does not affect initramfs based booting, here + the devtmpfs filesystem always needs to be mounted manually + after the roots is mounted. + With this option enabled, it allows to bring up a system in + rescue mode with init=/bin/sh, even when the /dev directory + on the rootfs is completely empty. + If unsure, say Y here. config STANDALONE bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL -- 1.7.0.1