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    SubjectRe: Linux 2.6.25-rc2 regression: LVM cannot find volume group
    [added CCs from the other thread on this topic]

    Alasdair G Kergon schrieb:
    > On Sat, Feb 16, 2008 at 11:37:37PM +0100, Jiri Slaby wrote:
    >> # CONFIG_SYSFS_DEPRECATED is not set
    > IMHO That should be *set* by default until everyone has had time to
    > update their userspace software to cope with the changed sysfs layout.

    It *is* set by default.

    The root cause of the trouble is that its semantics are changing.
    At one point in time (sorry, don't remember which kernel release
    exactly) I tested whether the openSUSE 10.3 userspace supported
    a CONFIG_SYSFS_DEPRECATED=n kernel and found that it did. From
    then on, "make oldconfig" would carry that setting over to every
    new kernel I built, which was fine while the meaning of this
    setting - ie. the difference in sysfs layout it controlled -
    stayed the same.

    With commit edfaa7c36574f1bf09c65ad602412db9da5f96bf however, the
    sysfs layout changed again, so the same CONFIG_SYSFS_DEPRECATED
    setting now controls a different difference (argh) in sysfs
    layout. That kind of situation is not handled very well by
    "make oldconfig", which basically starts from the assumption
    that a setting that was ok for the previous kernel version is
    still ok for the new one.

    I see two ways of avoiding that problem: either create a new
    backward compatibility config setting for that new sysfs change,
    or create a way of telling "make oldconfig" that the semantics of
    CONFIG_SYSFS_DEPRECATED have changed and it should ask the user
    for that again even if there is a previous setting.


    Tilman Schmidt E-Mail:
    Bonn, Germany
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