[src/trunk]: src/sys/rump/librump/rumpkern rumpkern/scheduler: Use membar_rel...

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

details:   https://anonhg.NetBSD.org/src/rev/5dd50ac3131b
branches:  trunk
changeset: 365165:5dd50ac3131b
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sat Apr 09 23:45:14 2022 +0000

description:
rumpkern/scheduler: Use membar_release.

...but add an XXX comment asking for clarity on what it pairs with.

diffstat:

 sys/rump/librump/rumpkern/scheduler.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 5bad7ef9ff57 -r 5dd50ac3131b sys/rump/librump/rumpkern/scheduler.c
--- a/sys/rump/librump/rumpkern/scheduler.c     Sat Apr 09 23:45:02 2022 +0000
+++ b/sys/rump/librump/rumpkern/scheduler.c     Sat Apr 09 23:45:14 2022 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: scheduler.c,v 1.52 2020/11/01 20:58:38 christos Exp $ */
+/*      $NetBSD: scheduler.c,v 1.53 2022/04/09 23:45:14 riastradh Exp $        */
 
 /*
  * Copyright (c) 2010, 2011 Antti Kantee.  All Rights Reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: scheduler.c,v 1.52 2020/11/01 20:58:38 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: scheduler.c,v 1.53 2022/04/09 23:45:14 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -473,7 +473,7 @@
        if (interlock == rcpu->rcpu_mtx)
                rumpuser_mutex_enter_nowrap(rcpu->rcpu_mtx);
        else
-               membar_exit();
+               membar_release(); /* XXX what does this pair with? */
 
        /* Release the CPU. */
        old = atomic_swap_ptr(&rcpu->rcpu_prevlwp, l);