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Commit 474c2568 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] i386: make fault notifier unconditional and export it



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: default avatarAndi Kleen <ak@suse.de>
parent 273819a2
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+4 −10
Original line number Diff line number Diff line
@@ -30,18 +30,20 @@

extern void die(const char *,struct pt_regs *,long);

#ifdef CONFIG_KPROBES
ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);

int register_page_fault_notifier(struct notifier_block *nb)
{
	vmalloc_sync_all();
	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)
{
	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,
			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);
}
#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