[src/trunk]: src/sys/arch/x86/x86 Make sure the assignment to "idepth" is don...

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

details:   https://anonhg.NetBSD.org/src/rev/36c8a840e542
branches:  trunk
changeset: 846878:36c8a840e542
user:      hannken <hannken%NetBSD.org@localhost>
date:      Tue Dec 03 11:50:45 2019 +0000

description:
Make sure the assignment to "idepth" is done inside the loop to prevent
preemption between loop end and dereference of "l_cpu->ci_depth".

diffstat:

 sys/arch/x86/x86/x86_machdep.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r b34665ce0c34 -r 36c8a840e542 sys/arch/x86/x86/x86_machdep.c
--- a/sys/arch/x86/x86/x86_machdep.c    Tue Dec 03 11:50:16 2019 +0000
+++ b/sys/arch/x86/x86/x86_machdep.c    Tue Dec 03 11:50:45 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: x86_machdep.c,v 1.131 2019/12/03 11:50:16 hannken Exp $        */
+/*     $NetBSD: x86_machdep.c,v 1.132 2019/12/03 11:50:45 hannken Exp $        */
 
 /*-
  * Copyright (c) 2002, 2006, 2007 YAMAMOTO Takashi,
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.131 2019/12/03 11:50:16 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.132 2019/12/03 11:50:45 hannken Exp $");
 
 #include "opt_modular.h"
 #include "opt_physmem.h"
@@ -350,7 +350,7 @@
 cpu_intr_p(void)
 {
        uint64_t ncsw;
-       int idepth;
+       volatile int idepth;
        lwp_t *l;
 
        l = curlwp;