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    Subject[PATCHSET 2/4] sysfs: allow suicide
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    Hello, all.

    This is the second patchset of four sysfs update patchset series[1]
    and to be applied on top of the first patchset[1].

    Currently, sysfs files which want to kill themselves should ask
    someone else (workqueue) to kill it, which is so inhumane. This
    patchset updates sysfs file implementation such that sysfs files can
    commit suicide peacefully.

    Global sledgehammer module unload inhibition/delay mechanism is
    implemented and used to prevent premature unload while suicide is in
    progress. Suicide attempt is detected by scanning sysfs_buffers for
    matching accessor. If suicide is detected, active references the
    accessor were holding are dropped early such that the suiciding node
    can be deactivated without deadlock.

    As active references go away early, the module basing the code the
    accessor is running can go away before it finishes. Global module
    unload inhibition is used here to prevent that until accessor callback
    is complete.

    This patchset contains the following four patches.

    0001-module-implement-module_inhibit_unload.patch
    0002-sysfs-make-the-sysfs_addrm_cxt-removed-list-FIFO.patch
    0003-sysfs-care-free-suicide-for-sysfs-files.patch
    0004-sysfs-make-suicidal-nodes-just-do-it-directly.patch

    0001 needs Rusty Russell's ack.

    Thanks.

    --
    tejun

    [1] http://thread.gmane.org/gmane.linux.kernel/582105


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