[src/trunk]: src/sys/arch/sparc/sparc print the cpu number for the mutex not ...

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

details:   https://anonhg.NetBSD.org/src/rev/948bfa488373
branches:  trunk
changeset: 448515:948bfa488373
user:      mrg <mrg%NetBSD.org@localhost>
date:      Mon Feb 04 09:57:39 2019 +0000

description:
print the cpu number for the mutex not held xcallintr debug message.
add a comment about why this case fires.

diffstat:

 sys/arch/sparc/sparc/intr.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r 6d3b8e41cca1 -r 948bfa488373 sys/arch/sparc/sparc/intr.c
--- a/sys/arch/sparc/sparc/intr.c       Mon Feb 04 09:56:48 2019 +0000
+++ b/sys/arch/sparc/sparc/intr.c       Mon Feb 04 09:57:39 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: intr.c,v 1.119 2017/12/02 00:48:05 macallan Exp $ */
+/*     $NetBSD: intr.c,v 1.120 2019/02/04 09:57:39 mrg Exp $ */
 
 /*
  * Copyright (c) 1992, 1993
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.119 2017/12/02 00:48:05 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.120 2019/02/04 09:57:39 mrg Exp $");
 
 #include "opt_multiprocessor.h"
 #include "opt_sparc_arch.h"
@@ -366,10 +366,14 @@
        if (v != xcallintr)
                cpuinfo.ci_sintrcnt[13].ev_count++;
 
+       /*
+        * This happens when the remote CPU is slow at responding and the
+        * caller gave up, and has given up the mutex.
+        */
        if (mutex_owned(&xpmsg_mutex) == 0) {
                cpuinfo.ci_xpmsg_mutex_not_held.ev_count++;
 #ifdef DEBUG
-               printf("%s: mutex not held\n", __func__);
+               printf("%s: cpu%d mutex not held\n", __func__, cpu_number());
 #endif
                cpuinfo.msg.complete = 1;
                kpreempt_enable();