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    SubjectRe: [PATCH 1/2] add tunable_notifier function
    Date
    Takenori Nagano <t-nagano@ah.jp.nec.com> writes:

    > This patch adds new notifier function tunable_notifier_chain. Its base is
    > atomic_notifier_chain.



    > +/**
    > + * tunable_notifier_chain_register - Add notifier to an tunable notifier chain
    > + * @nh: Pointer to head of the tunable notifier chain
    > + * @n: New entry in notifier chain
    > + * @name: Pointer to the name of this notifier chain
    > + * @desc: Pointer to the description of new entry
    > + *
    > + * Adds a notifier to an tunable notifier chain and makes control dir.
    > + *
    > + * Returns zero on success or %-ENODEV on failure.
    > + */
    > +
    > +int tunable_notifier_chain_register(struct tunable_notifier_head *nh,
    > + struct tunable_notifier_block *n, char *name, char *desc)
    > +{
    > + unsigned long flags;
    > + int ret = -EINVAL;
    > + struct dentry *nh_dir, *nb_dir, *pri_dentry, *desc_dentry = NULL;
    > +
    > + if (!name)
    > + goto nb_fail;
    > +
    > + ret = -ENOMEM;
    > + if (!nh->dir) {
    > + nh_dir = debugfs_create_dir(nh->name, NULL);

    Hmm. debugfs does not appear to be an appropriate place to create
    files that are supposed to be part of a serious user space interface.

    Eric
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