commit 576fe0bd7e52dce7afb6b9b2450744555b2eb53a
author Christoph Hellwig <hch@lst.de> Wed May 16 14:52:19 2007 +0200
committer Tony Luck <tony.luck@intel.com> Wed May 16 09:00:51 2007 -0700
tree acf2a5f8d7f7906cfa2da9bf53a74d8e3fcd42bb
parent 17028c5c91580036eb41da2fad292965fa3b9a7d

[IA64] optimize pagefaults a little

Get rid of the notifier list and call the kprobes code directly
if compiled in.  This mirrors the changes that recently went
into powerpc, s390 and sparc64.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/mm/fault.c

diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 21658e0..b87f785 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -19,36 +19,24 @@
 extern void die (char *, struct pt_regs *, long);
 
 #ifdef CONFIG_KPROBES
-ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
-
-/* Hook to register for page fault notifications */
-int register_page_fault_notifier(struct notifier_block *nb)
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
 {
-	return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
-}
+	int ret = 0;
 
-int unregister_page_fault_notifier(struct notifier_block *nb)
-{
-	return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
-}
+	if (!user_mode(regs)) {
+		/* kprobe_running() needs smp_processor_id() */
+		preempt_disable();
+		if (kprobe_running() && kprobes_fault_handler(regs, trap))
+			ret = 1;
+		preempt_enable();
+	}
 
-static inline int notify_page_fault(enum die_val val, const char *str,
-			struct pt_regs *regs, long err, int trap, int sig)
-{
-	struct die_args args = {
-		.regs = regs,
-		.str = str,
-		.err = err,
-		.trapnr = trap,
-		.signr = sig
-	};
-	return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
+	return ret;
 }
 #else
-static inline int notify_page_fault(enum die_val val, const char *str,
-			struct pt_regs *regs, long err, int trap, int sig)
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
 {
-	return NOTIFY_DONE;
+	return 0;
 }
 #endif
 
@@ -117,8 +105,7 @@
 	/*
 	 * This is to handle the kprobes on user space access instructions
 	 */
-	if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, code, TRAP_BRKPT,
-					SIGSEGV) == NOTIFY_STOP)
+	if (notify_page_fault(regs, TRAP_BRKPT))
 		return;
 
 	down_read(&mm->mmap_sem);