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author | Kay Sievers <kay.sievers@vrfy.org> | 2010-01-14 22:47:57 +0100 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-08 02:04:48 +0100 |
commit | 4237e5fd3e07da268029cd4862cf551d9a74e33f (patch) | |
tree | 22a1729bcfec67a63e2bf33485d11a3b77045300 /drivers/base | |
parent | Driver-Core: devtmpfs - reset inode permissions before unlinking (diff) | |
download | linux-4237e5fd3e07da268029cd4862cf551d9a74e33f.tar.xz linux-4237e5fd3e07da268029cd4862cf551d9a74e33f.zip |
Driver-Core: devtmpfs - remove EXPERIMENTAL and flush out the description
All major distros enable devtmpfs on recent systems, so remove
the EXPERIMENTAL flag, and make the description a bit more instructive.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/Kconfig | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index ee377270beb9..8021e19fa1ea 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -9,29 +9,36 @@ 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 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. config DEVTMPFS_MOUNT - bool "Automount devtmpfs at /dev" + bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" depends on DEVTMPFS 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. config STANDALONE bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL |