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Commit 273819a2 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

[PATCH] 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 5e4edbb7

arch/x86_64/mm/fault.c

+3 −9
Original line number Original line Diff line number Diff line
@@ -40,8 +40,7 @@ 
#define PF_RSVD	(1<<3)

#define PF_RSVD	(1<<3)

#define PF_INSTR	(1<<4)

#define PF_INSTR	(1<<4)





#ifdef CONFIG_KPROBES

static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);

ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);





/* Hook to register for page fault notifications */

/* Hook to register for page fault notifications */

int register_page_fault_notifier(struct notifier_block *nb)

int register_page_fault_notifier(struct notifier_block *nb)
@@ -49,11 +48,13 @@ 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)
@@ -67,13 +68,6 @@ 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





void bust_spinlocks(int yes)

void bust_spinlocks(int yes)

{

{