On Thu, 18 Oct 2007 17:53:00 +0900 Takenori Nagano wrote:
> This patch adds new notifier function tunable_notifier_chain. Its base is
> atomic_notifier_chain.
>
> Thanks,
>
> ---
>
> Signed-off-by: Takenori Nagano <t-nagano at ah.jp.nec.com>
>
> ---
> diff -uprN linux-2.6.23.orig/kernel/sys.c linux-2.6.23/kernel/sys.c
> --- linux-2.6.23.orig/kernel/sys.c 2007-10-10 05:31:38.000000000 +0900
> +++ linux-2.6.23/kernel/sys.c 2007-10-18 10:08:52.728000000 +0900
> @@ -38,6 +38,7 @@
> #include <linux/syscalls.h>
> #include <linux/kprobes.h>
> #include <linux/user_namespace.h>
> +#include <linux/debugfs.h>
>
> #include <asm/uaccess.h>
> #include <asm/io.h>
> @@ -393,6 +394,243 @@ int blocking_notifier_call_chain(struct
> EXPORT_SYMBOL_GPL(blocking_notifier_call_chain);
> +/**
> + * tunable_atomic_notifier_chain_register
> + * - Add notifier to an tunable notifier chain
Function name & short description must be on one (long?) line. :(
> + * @nh: Pointer to head of the tunable notifier chain
> + * @n: New entry in notifier chain
> + * @name: Pointer to the name of the new notifier entry
> + * @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_atomic_notifier_chain_register(
> + struct tunable_atomic_notifier_head *nh,
> + struct tunable_atomic_notifier_block *n, char *name, char *desc)
> +{
> +}
> +
> +EXPORT_SYMBOL_GPL(tunable_atomic_notifier_chain_register);
> +
> +/**
> + * tunable_atomic_notifier_chain_unregister
> + * - Remove notifier from a tunable notifier chain
Ditto.
> + * @nh: Pointer to head of the tunable notifier chain
> + * @n: Entry to remove from notifier chain
> + *
> + * Removes a notifier from a tunable notifier chain.
> + *
> + * Retunrns zero on success or %-ENOENT on failure.
> + */
> +
> +int tunable_atomic_notifier_chain_unregister(
> + struct tunable_atomic_notifier_head *nh,
> + struct tunable_atomic_notifier_block *n)
> +{
> +}
> +
> +EXPORT_SYMBOL_GPL(tunable_atomic_notifier_chain_unregister);
> +
> +/**
> + * __tunable_atomic_notifier_call_chain
> + * - Call functions in a tunable notifier chain
Same.
> + * @nh: Pointer to head of the tunable notifier chain
> + * @val: Value passed unmodified to notifier function
> + * @v: Pointer passed unmodified to notifier function
> + * @nt_to_call: See the comment for notifier_call_chain
@nr_to_call: ...
> + * @nr_calls: See the comment for notifier_call_chain
> + *
> + * Calls each function in a notifier chain in turn. The functions
> + * run in an atomic context, so they must not block.
> + * This routine uses RCU to synchronize with changes to the chain.
> + *
> + * If the return value of the notifier can be and'ed
> + * with %NOTIFY_STOP_MASK then tunable_atomic_notifier_call_chain()
> + * will return immediately, with the return value of
> + * the notifier function which halted execution.
> + * Otherwise the return value is the return value
> + * of the last notifier function called.
> + */
> +
> +int __kprobes __tunable_atomic_notifier_call_chain(
> + struct tunable_atomic_notifier_head *nh,
> + unsigned long val, void *v,
> + int nr_to_call, int *nr_calls)
> +{
> + int ret;
> +
> + rcu_read_lock();
> + ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls);
> + rcu_read_unlock();
> + return ret;
> +}
> +
> +EXPORT_SYMBOL_GPL(__tunable_atomic_notifier_call_chain);
Blank line is usually omitted before EXPORT_SYMBOL....
---
~Randy
