linux-kernel - [16/66] tracing/x86: Dont use mcount in pvclock.c

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Message-Id: <20101022183557.673045740@clark.site>
Date:	Fri, 22 Oct 2010 11:34:43 -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>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [16/66] tracing/x86: Dont use mcount in pvclock.c

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

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

From: Jeremy Fitzhardinge <jeremy@...p.org>

commit 9ecd4e1689208afe9b059a5ce1333acb2f42c4d2 upstream.

When using a paravirt clock, pvclock.c can be used by sched_clock(),
which in turn is used by the tracing mechanism for timestamps,
which leads to infinite recursion.

Disable mcount/tracing for pvclock.o.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
LKML-Reference: <4C9A9A3F.4040201@...p.org>
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
@@ -11,6 +11,7 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_tsc.o = -pg
 CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
+CFLAGS_REMOVE_pvclock.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 endif


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