Module Name: src
Committed By: ad
Date: Wed Dec 11 20:46:06 UTC 2019
Modified Files:
src/sys/kern: kern_mutex.c
Log Message:
Comment on previous explaining why it's needed.
To generate a diff of this commit:
cvs rdiff -u -r1.85 -r1.86 src/sys/kern/kern_mutex.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/kern_mutex.c
diff -u src/sys/kern/kern_mutex.c:1.85 src/sys/kern/kern_mutex.c:1.86
--- src/sys/kern/kern_mutex.c:1.85 Wed Dec 11 20:34:06 2019
+++ src/sys/kern/kern_mutex.c Wed Dec 11 20:46:06 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_mutex.c,v 1.85 2019/12/11 20:34:06 ad Exp $ */
+/* $NetBSD: kern_mutex.c,v 1.86 2019/12/11 20:46:06 ad Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007, 2008, 2019 The NetBSD Foundation, Inc.
@@ -40,7 +40,7 @@
#define __MUTEX_PRIVATE
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_mutex.c,v 1.85 2019/12/11 20:34:06 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_mutex.c,v 1.86 2019/12/11 20:46:06 ad Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@@ -720,6 +720,11 @@ mutex_vector_exit(kmutex_t *mtx)
}
#ifndef __HAVE_MUTEX_STUBS
+ /*
+ * On some architectures without mutex stubs, we can enter here to
+ * release mutexes before interrupts and whatnot are up and running.
+ * We need this hack to keep them sweet.
+ */
if (__predict_false(cold)) {
MUTEX_UNLOCKED(mtx);
MUTEX_RELEASE(mtx);
