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    SubjectRe: [PATCH] EDAC: core EDAC support code
    On Tue, Mar 07, 2006 at 02:41:13AM -0800, Andrew Morton wrote:
    > Al Viro <> wrote:
    > >
    > > On Mon, Mar 06, 2006 at 01:53:44PM -0800, Greg KH wrote:
    > > > > rmmod your_turd </sys/spew/from/your_turd
    > > > > and there you go. rmmod can _NOT_ wait for sysfs references to go away.
    > > >
    > > > To be fair, the only part of the kernel that supports the above process,
    > > > is the network stack. And they implemented a special kind of lock to
    > > > handle just this kind of thing.
    > > >
    > > > That is not something that I want the rest of the kernel to have to use.
    > > > If your code blocks when doing the above thing, that's fine with me.
    > >
    > > One word: fail. With -EBUSY.
    > It seems quite simple to make wait_for_zero_refcount() interruptible?
    > Something like...

    That's something we need to do anyway, but here it's not a matter of removal
    blocking on module refcount:

    | Regarding the above problem with the kobject reference count, this
    | was recently fixed in the -mm tree (see edac-kobject-sysfs-fixes.patch
    | in 2.6.16-rc5-mm2). The fix I implemented was to add a call to
    | complete() in edac_memctrl_master_release() and then have the module
    | cleanup code wait for the completion. I think there were a few other
    | instances of this type of problem that I also fixed in the
    | above-mentioned patch.

    and that is clearly broken. Moreover, unlike having rmmod -w interruptible
    (which is obviously a very good idea), here we would be in the middle of
    cleanup sequence and it would be too late to back off if interrupted.
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