From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Tue, 8 Jul 2008 22:06:30 +0000 (-0700)
Subject: xen: print backtrace on multicall failure
X-Git-Tag: v2.6.27-rc1~955^2~1^20~60
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=8ba6c2b0958c332d2f3336f4ca9c116ed81f38e9;p=~shefty%2Frdma-dev.git

xen: print backtrace on multicall failure

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

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 3c63c4da7ed..9efd1c6c977 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -76,6 +76,7 @@ void xen_mc_flush(void)
 		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,