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);