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[PATCH] i386: make fault notifier unconditional and export it

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It's needed for external debuggers and overhead is very small.

Also make the actual notifier chain they use static

Cc: jbeulich@novell.com

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen
2006-09-26 10:52:35 +02:00
committed by Andi Kleen
parent 273819a2d9
commit 474c256841
1 changed files with 4 additions and 10 deletions
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14
arch/i386/mm/fault.c
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@@ -30,18 +30,20 @@
extern void die(const char *,struct pt_regs *,long); extern void die(const char *,struct pt_regs *,long);
#ifdef CONFIG_KPROBES static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
int register_page_fault_notifier(struct notifier_block *nb) int register_page_fault_notifier(struct notifier_block *nb)
{ {
vmalloc_sync_all(); vmalloc_sync_all();
return atomic_notifier_chain_register(&notify_page_fault_chain, nb); return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
} }
EXPORT_SYMBOL_GPL(register_page_fault_notifier);
int unregister_page_fault_notifier(struct notifier_block *nb) int unregister_page_fault_notifier(struct notifier_block *nb)
{ {
return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb); return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
} }
EXPORT_SYMBOL_GPL(unregister_page_fault_notifier);
static inline int notify_page_fault(enum die_val val, const char *str, static inline int notify_page_fault(enum die_val val, const char *str,
struct pt_regs *regs, long err, int trap, int sig) struct pt_regs *regs, long err, int trap, int sig)
@@ -55,14 +57,6 @@ static inline int notify_page_fault(enum die_val val, const char *str,
}; };
return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args); return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
} }
#else
static inline int notify_page_fault(enum die_val val, const char *str,
struct pt_regs *regs, long err, int trap, int sig)
{
return NOTIFY_DONE;
}
#endif
/* /*
* Unlock any spinlocks which will prevent us from getting the * Unlock any spinlocks which will prevent us from getting the