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debug: add notifier chain debugging, v2

Browse source 
- unbreak ia64 (and powerpc) where function pointers dont
  point at code but at data (reported by Tony Luck)

[ mingo@elte.hu: various cleanups ]

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arjan van de Ven 2008-08-15 15:29:38 -07:00 • committed by Ingo Molnar
parent fb822db465
commit ab7476cf76
4 changed files with 21 additions and 10 deletions
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10
kernel/notifier.c
View file

@ -21,10 +21,6 @@ BLOCKING_NOTIFIER_HEAD(reboot_notifier_list);
static int notifier_chain_register(struct notifier_block **nl,
struct notifier_block *n)
{
if (!kernel_text_address((unsigned long)n->notifier_call)) {
WARN(1, "Invalid notifier registered!");
return 0;
}
while ((*nl) != NULL) {
if (n->priority > (*nl)->priority)
break;
@ -38,10 +34,6 @@ static int notifier_chain_register(struct notifier_block **nl,
static int notifier_chain_cond_register(struct notifier_block **nl,
struct notifier_block *n)
{
if (!kernel_text_address((unsigned long)n->notifier_call)) {
WARN(1, "Invalid notifier registered!");
return 0;
}
while ((*nl) != NULL) {
if ((*nl) == n)
return 0;
@ -92,7 +84,7 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
next_nb = rcu_dereference(nb->next);
#ifdef CONFIG_DEBUG_NOTIFIERS
if (!kernel_text_address((unsigned long)nb->notifier_call)) {
if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
WARN(1, "Invalid notifier called!");
nb = next_nb;
continue;