linux-kernel - [patch 3/3] x86, bts: correctly report invalid bts records

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Message-ID: <20081216155311.A30159@sedona.ch.intel.com>
Date:	Tue, 16 Dec 2008 15:53:11 +0100
From:	Markus Metzger <markus.t.metzger@...el.com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com
Cc:	markus.t.metzger@...el.com, markus.t.metzger@...il.com,
	roland@...hat.com, eranian@...glemail.com
Subject: [patch 3/3] x86, bts: correctly report invalid bts records

Correctly report a cleared BTS record as invalid. Used to be reported
as branch from 0 to 0.


Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
---

Index: ftrace/arch/x86/kernel/ds.c
===================================================================
--- ftrace.orig/arch/x86/kernel/ds.c	2008-12-15 09:29:05.000000000 +0100
+++ ftrace/arch/x86/kernel/ds.c	2008-12-15 11:32:04.000000000 +0100
@@ -484,6 +484,9 @@
 		out->qualifier = bts_branch;
 		out->variant.lbr.from = bts_get(at, bts_from);
 		out->variant.lbr.to   = bts_get(at, bts_to);
+
+		if (!out->variant.lbr.from && !out->variant.lbr.to)
+			out->qualifier = bts_invalid;
 	}
 
 	return ds_cfg.sizeof_rec[ds_bts];
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