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    Subject[PATCH 0/10] CPU hotplug error handling fixes
    This series of patches fixes the error handling for cpu hotplug.
    The problem is revealed by CPU hotplug/unplug test with fault-injection.

    The patch 1-3 are sysfs or driver core related error handling fixes.
    These are not directly related to cpu hotplug. But these are needed to
    pass the stress test.

    The patch 4 changes the behavior when one of the callbacks in notifier
    chain returns NOTIFY_BAD with CPU_UP_PREPARE event. This change makes
    cpu hotplug error handling simple.

    The patch 5 simplifies the cpu hotplug event handling in topology.c
    by the patch 4.

    The patch 6-10 are error handling fixes in cpu hotplug event callbacks.
    These fixes also depend on the change by the patch 4.

    Here is the test script I have confirmed with these patches.
    I guess we still have the similar bugs that I could not test due to no
    hardware. So it may be worth someone trying this script.

    ----------[ cut here ]----------

    #!/bin/bash

    FAILTYPE=failslab
    CPU=1
    CPU_ONLINE=/sys/devices/system/cpu/cpu${CPU}/online

    faulty_system()
    {
    bash -c "echo 1 > /proc/self/make-it-fail && exec $*"
    }

    [ "$UID" == 0 ] || exit 1
    [ -n "$FAILTYPE" -a -f /debug/$FAILTYPE/probability ] || exit 1
    [ -f $CPU_ONLINE ] || exit 1

    echo N > /debug/$FAILTYPE/ignore-gfp-wait
    echo Y > /debug/$FAILTYPE/task-filter
    echo 1 > /debug/$FAILTYPE/probability
    echo -1 > /debug/$FAILTYPE/times

    while true
    do
    faulty_system "echo 0 > $CPU_ONLINE"
    faulty_system "echo 1 > $CPU_ONLINE"
    done

    -
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