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    Subject[PATCH for review] [123/145] i386: make fault notifier unconditional and export it
    Date
    r

    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>

    ---
    arch/x86_64/mm/fault.c | 12 +++---------
    1 files changed, 3 insertions(+), 9 deletions(-)

    Index: linux/arch/x86_64/mm/fault.c
    ===================================================================
    --- linux.orig/arch/x86_64/mm/fault.c
    +++ linux/arch/x86_64/mm/fault.c
    @@ -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
    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
    };
    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)
    {
    -
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