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    SubjectRe: [patch] drivers: wait for threaded probes between initcall levels
    On Fri, 27 Oct 2006 11:42:37 -0700
    Andrew Morton <akpm@osdl.org> wrote:

    > From: Andrew Morton <akpm@osdl.org>
    >
    > The multithreaded-probing code has a problem: after one initcall level (eg,
    > core_initcall) has been processed, we will then start processing the next
    > level (postcore_initcall) while the kernel threads which are handling
    > core_initcall are still executing. This breaks the guarantees which the
    > layered initcalls previously gave us.
    >
    > IOW, we want to be multithreaded _within_ an initcall level, but not between
    > different levels.
    >
    > Fix that up by causing the probing code to wait for all outstanding probes at
    > one level to complete before we start processing the next level.
    >
    > Cc: Greg KH <greg@kroah.com>
    > Signed-off-by: Andrew Morton <akpm@osdl.org>
    > ---
    >

    This looks like a good place to use a counting semaphore.

    --
    Stephen Hemminger <shemminger@osdl.org>
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