[PATCH] Only process_die notifier in ia64_do_page_fault if KPROBES is configured.

[Christoph Lameter <clameter@engr.sgi.com>]

ia64_do_page_fault is a path critical for system performance. The code to call
notify_die() should not be compiled into that critical path if the system
is not configured to use KPROBES.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.13-rc7/arch/ia64/mm/fault.c
===================================================================
--- linux-2.6.13-rc7.orig/arch/ia64/mm/fault.c	2005-08-23 20:39:14.000000000 -0700
+++ linux-2.6.13-rc7/arch/ia64/mm/fault.c	2005-08-25 13:04:57.000000000 -0700
@@ -103,12 +103,16 @@ ia64_do_page_fault (unsigned long addres
 		goto bad_area_no_up;
 #endif
 
+#ifdef CONFIG_KPROBES
 	/*
-	 * This is to handle the kprobes on user space access instructions
+	 * This is to handle the kprobes on user space access instructions.
+	 * This is a path criticial for system performance. So only
+	 * process this notifier if we are compiled with kprobes support.
 	 */
 	if (notify_die(DIE_PAGE_FAULT, "page fault", regs, code, TRAP_BRKPT,
 					SIGSEGV) == NOTIFY_STOP)
 		return;
+#endif
 
 	down_read(&mm->mmap_sem);
 
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