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    SubjectRe: [PATCH] driver-core: devtmpfs - driver core maintained /dev tmpfs
    On Thu, 30 Apr 2009 23:17:01 -0700 Greg KH <greg@kroah.com> wrote:

    > On Thu, Apr 30, 2009 at 10:29:00PM -0700, Andrew Morton wrote:
    > > On Thu, 30 Apr 2009 15:23:42 +0200 Kay Sievers <kay.sievers@vrfy.org> wrote:
    > >
    > > > From: Kay Sievers <kay.sievers@vrfy.org>
    > > > Subject: driver-core: devtmpfs - driver core maintained /dev tmpfs
    > > >
    > > > Devtmpfs lets the kernel create a tmpfs very early at kernel
    > > > initialization, before any driver core device is registered. Every
    > > > device with a major/minor will have a device node created in this
    > > > tmpfs instance. After the rootfs is mounted by the kernel, the
    > > > populated tmpfs is mounted at /dev. In initramfs, it can be moved
    > > > to the manually mounted root filesystem before /sbin/init is
    > > > executed.
    > >
    > > Lol, devfs.
    >
    > Well, devfs "done right" with hopefully none of the vfs problems the
    > last devfs had. :)

    I think Adam Richter's devfs rewrite (which, iirc, was tmpfs-based)
    would have fixed up these things. But it was never quite completed and
    came when minds were already made up.

    I don't understand why we need devfs2, really. What problems are
    people having with teh existing design?

    > > > block/bsg.c | 6
    > > > drivers/gpu/drm/drm_sysfs.c | 7
    > > > drivers/input/input.c | 6
    > > > drivers/media/dvb/dvb-core/dvbdev.c | 10 +
    > > > drivers/usb/core/usb.c | 11 +
    > >
    > > These five subsystems were updated, but there are so many others. Why
    > > these five in particular?
    >
    > These are the ones that create a subdirectory in /dev/ None of the
    > others do.

    oic.

    Where is it determined that these subsystems create /dev subdirectories?
    udev rules? If so, do we need to henceforth keep devfs2 (sorry, I
    can't resist) in sync with udev?


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