/*! 2016.11.19 study -ing */
static int __kprobes notifier_call_chain(struct notifier_block **nl,
unsigned long val, void *v,
int nr_to_call, int *nr_calls)
{
int ret = NOTIFY_DONE;
struct notifier_block *nb, *next_nb;
nb = rcu_dereference_raw(*nl);
while (nb && nr_to_call) {
next_nb = rcu_dereference_raw(nb->next);
#ifdef CONFIG_DEBUG_NOTIFIERS
if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
WARN(1, "Invalid notifier called!");
nb = next_nb;
continue;
}
#endif
ret = nb->notifier_call(nb, val, v);
if (nr_calls)
(*nr_calls)++;
if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK)
break;
nb = next_nb;
nr_to_call--;
}
return ret;
}
/**
* notifier_call_chain - Informs the registered notifiers about an event.
* @nl: Pointer to head of the blocking notifier chain
* @val: Value passed unmodified to notifier function
* @v: Pointer passed unmodified to notifier function
* @nr_to_call: Number of notifier functions to be called. Don't care
* value of this parameter is -1.
* @nr_calls: Records the number of notifications sent. Don't care
* value of this field is NULL.
* @returns: notifier_call_chain returns the value returned by the
* last notifier function called.
*/
static int __kprobes notifier_call_chain(struct notifier_block **nl,
unsigned long val, void *v,
int nr_to_call, int *nr_calls)
{
int ret = NOTIFY_DONE;
struct notifier_block *nb, *next_nb;
#if defined(CONFIG_SMP) && (defined(MTK_CPU_HOTPLUG_DEBUG_1) || defined(MTK_CPU_HOTPLUG_DEBUG_2))
int index = 0;
extern struct raw_notifier_head cpu_chain;
#endif //#if defined(CONFIG_SMP) && (defined(MTK_CPU_HOTPLUG_DEBUG_1) || defined(MTK_CPU_HOTPLUG_DEBUG_2))
nb = rcu_dereference_raw(*nl);
while (nb && nr_to_call) {
next_nb = rcu_dereference_raw(nb->next);
#ifdef CONFIG_DEBUG_NOTIFIERS
if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
WARN(1, "Invalid notifier called!");
nb = next_nb;
continue;
}
#endif
#if defined(CONFIG_SMP) && (defined(MTK_CPU_HOTPLUG_DEBUG_1) || defined(MTK_CPU_HOTPLUG_DEBUG_2))
if (nl == &cpu_chain.head)
{
#if defined(MTK_CPU_HOTPLUG_DEBUG_1)
printk(KERN_DEBUG "[cpu_ntf] %02lx_%02d, %p\n", val, index, nb->notifier_call);
#endif //#if defined(MTK_CPU_HOTPLUG_DEBUG_1)
#if defined(MTK_CPU_HOTPLUG_DEBUG_2)
aee_rr_rec_hoplug(0, val & 0xff, index & 0xff);
#endif //#if defined(MTK_CPU_HOTPLUG_DEBUG_2)
++index;
}
#endif //#if defined(CONFIG_SMP) && (defined(MTK_CPU_HOTPLUG_DEBUG_1) || defined(MTK_CPU_HOTPLUG_DEBUG_2))
ret = nb->notifier_call(nb, val, v);
if (nr_calls)
(*nr_calls)++;
if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK)
break;
nb = next_nb;
nr_to_call--;
}
return ret;
}
