From: visa <visa@openbsd.org>
Date: Fri, 11 Feb 2022 07:27:07 +0000 (+0000)
Subject: Check klist emptiness instead of NULL pointer in KNOTE()
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=8ebb68641b7e0d195bfb5e976d65df194f085a25;p=openbsd

Check klist emptiness instead of NULL pointer in KNOTE()

All callers of KNOTE() supply a non-NULL klist argument. Replace the
NULL pointer check with klist emptiness check as a small optimization.

OK mpi@
---

diff --git a/sys/sys/event.h b/sys/sys/event.h
index 76272cc0280..eb00575fc70 100644
--- a/sys/sys/event.h
+++ b/sys/sys/event.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: event.h,v 1.63 2022/02/11 07:25:50 visa Exp $	*/
+/*	$OpenBSD: event.h,v 1.64 2022/02/11 07:27:07 visa Exp $	*/
 
 /*-
  * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
@@ -154,7 +154,7 @@ struct klist {
 
 #define KNOTE(list, hint)	do { \
 					struct klist *__list = (list); \
-					if (__list != NULL) \
+					if (!klist_empty(__list)) \
 						knote(__list, hint); \
 				} while (0)