Use of die_notifiers is a debugging feature that is only used if
CONFIG_DEBUG_KERNEL is set. For a kernel without debugging there is no
need of die notifiers. This will generate no code for notify_die if
debugging is not on. Seems that there is an expectation that future distro
releases will have CONFIG_KPROBES on. They will therefore also have
CONFIG_DEBUG_KERNEL set and thus the die notifiers will work and the
notifier will be enabled in do_ia64_page_fault.
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6.13/include/asm-ia64/kdebug.h
===================================================================
--- linux-2.6.13.orig/include/asm-ia64/kdebug.h 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/include/asm-ia64/kdebug.h 2005-08-31 12:35:17.000000000 -0700
@@ -35,14 +35,15 @@ struct die_args {
int signr;
};
-int register_die_notifier(struct notifier_block *nb);
-extern struct notifier_block *ia64die_chain;
-
enum die_val {
DIE_BREAK = 1,
DIE_SS,
DIE_PAGE_FAULT,
};
+#ifdef CONFIG_DEBUG_KERNEL
+extern struct notifier_block *ia64die_chain;
+
+int register_die_notifier(struct notifier_block *nb);
static inline int notify_die(enum die_val val, char *str, struct pt_regs *regs,
long err, int trap, int sig)
@@ -57,5 +58,11 @@ static inline int notify_die(enum die_va
return notifier_call_chain(&ia64die_chain, val, &args);
}
+#else
+
+#define notify_die(val, str, regs, err, trap, sig) 0
+#define register_die_notifier(nb) do { } while (0)
+
+#endif
#endif
Index: linux-2.6.13/arch/ia64/kernel/traps.c
===================================================================
--- linux-2.6.13.orig/arch/ia64/kernel/traps.c 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/arch/ia64/kernel/traps.c 2005-08-31 12:35:17.000000000 -0700
@@ -28,6 +28,7 @@ extern spinlock_t timerlist_lock;
fpswa_interface_t *fpswa_interface;
EXPORT_SYMBOL(fpswa_interface);
+#ifdef CONFIG_DEBUG_KERNEL
struct notifier_block *ia64die_chain;
static DEFINE_SPINLOCK(die_notifier_lock);
@@ -40,6 +41,7 @@ int register_die_notifier(struct notifie
spin_unlock_irqrestore(&die_notifier_lock, flags);
return err;
}
+#endif
void __init
trap_init (void)
-
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