[src/trunk]: src/sys/kern Remove an unneeded ifdef MULTIPROCESSOR.

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c5896fb7d648
branches:  trunk
changeset: 745305:c5896fb7d648
user:      ad <ad%NetBSD.org@localhost>
date:      Thu Feb 27 20:52:25 2020 +0000

description:
Remove an unneeded ifdef MULTIPROCESSOR.

diffstat:

 sys/kern/kern_lwp.c |  10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diffs (38 lines):

diff -r 628af65c5d25 -r c5896fb7d648 sys/kern/kern_lwp.c
--- a/sys/kern/kern_lwp.c       Thu Feb 27 20:16:38 2020 +0000
+++ b/sys/kern/kern_lwp.c       Thu Feb 27 20:52:25 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_lwp.c,v 1.227 2020/02/15 18:12:15 ad Exp $        */
+/*     $NetBSD: kern_lwp.c,v 1.228 2020/02/27 20:52:25 ad Exp $        */
 
 /*-
  * Copyright (c) 2001, 2006, 2007, 2008, 2009, 2019, 2020
@@ -211,7 +211,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.227 2020/02/15 18:12:15 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.228 2020/02/27 20:52:25 ad Exp $");
 
 #include "opt_ddb.h"
 #include "opt_lockdebug.h"
@@ -1305,18 +1305,14 @@
                mutex_exit(p->p_lock);
        }
 
-#ifdef MULTIPROCESSOR
        /*
         * In the unlikely event that the LWP is still on the CPU,
-        * then spin until it has switched away.  We need to release
-        * all locks to avoid deadlock against interrupt handlers on
-        * the target CPU.
+        * then spin until it has switched away.
         */
        membar_consumer();
        while (__predict_false((l->l_pflag & LP_RUNNING) != 0)) {
                SPINLOCK_BACKOFF_HOOK;
        }
-#endif
 
        /*
         * Destroy the LWP's remaining signal information.