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    SubjectRe: 2.6.11-rc3-mm1 : can't insmod dm-mod
    Laurent Riffard <laurent.riffard@free.fr> wrote:
    >
    > Le 04.02.2005 19:33, Andrew Morton a écrit :
    > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.11-rc3/2.6.11-rc3-mm1/
    > >
    >
    > loading dm-mod module fails with this message :
    >
    > FATAL: Error inserting dm-mod
    > (/lib/modules/2.6.11-rc3-mm1/kernel/drivers/md/dm-mod.ko): Device or resource busy
    >
    > The following line appears in dmesg :
    >
    > register_blkdev: failed to get major for device-mapper

    You've enabled CONFIG_BASE_SMALL and so the major_names[] hashtable has
    just one element. device-mapper uses dynamic major allocation, the range
    of which is limited to the size of the top-level major_names[] array. You
    ran out of slots and register_blkdev() failed.

    So for now I guess we must drop base-small-shrink-major_names-hash.patch.

    Al, that code looks rather crappy. Shouldn't we be using an idr tree or
    something?

    Also, we can never generate a major number of zero if the caller passed in
    major=0. How come?


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