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

#define PF_INSTR	(1<<4)



#ifdef CONFIG_KPROBES

ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);

static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);



/* Hook to register for page fault notifications */

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();

	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)
@@ -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);

}

#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)

{