linux-kernel - [PATCH 08 of 55] xen: print backtrace on multicall failure

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Date:	Tue, 08 Jul 2008 15:06:30 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Stephen Tweedie <sct@...hat.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Mark McLoughlin <markmc@...hat.com>, x86@...nel.org
Subject: [PATCH 08 of 55] xen: print backtrace on multicall failure

Print a backtrace if a multicall fails, to help with debugging.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/multicalls.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -76,6 +76,7 @@
 		if (ret) {
 			printk(KERN_ERR "%d multicall(s) failed: cpu %d\n",
 			       ret, smp_processor_id());
+			dump_stack();
 			for (i = 0; i < b->mcidx; i++) {
 				printk("  call %2d/%d: op=%lu arg=[%lx] result=%ld\n",
 				       i+1, b->mcidx,


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