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    SubjectRe: [PATCH] fix race in mark_mounts_for_expiry()
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    > > How about this patch?  It tries to solve this race without additional
    > > locking. If refcount is already zero, it will increment and decrement
    > > it. So be careful to only call grab_namespace() with vfsmount_lock
    > > held, otherwise it could race with itself. (vfsmount_lock is also
    > > needed in this case so that mnt->mnt_namespace, doesn't change, while
    > > grabbing the namespace)
    >
    > How about using cmpxchg?

    How? If the count is nonzero, an incremented count must be stored.
    You can't do that atomically with cmpxchg.

    Miklos

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