linux-kernel - [030/103] tracing/x86: Dont use mcount in kvmclock.c

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Message-Id: <20101022185230.030613191@clark.site>
Date:	Fri, 22 Oct 2010 11:51:04 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Avi Kivity <avi@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [030/103] tracing/x86: Dont use mcount in kvmclock.c

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Steven Rostedt <srostedt@...hat.com>

commit 258af47479980d8238a04568b94a4e55aa1cb537 upstream.

The guest can use the paravirt clock in kvmclock.c which is used
by sched_clock(), which in turn is used by the tracing mechanism
for timestamps, which leads to infinite recursion.

Disable mcount/tracing for kvmclock.o.

Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Avi Kivity <avi@...hat.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kernel/Makefile |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -12,6 +12,7 @@ CFLAGS_REMOVE_tsc.o = -pg
 CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
 CFLAGS_REMOVE_pvclock.o = -pg
+CFLAGS_REMOVE_kvmclock.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 endif


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