linux-kernel - [patch 8/14] x86, ds: fix bounds check in ds selftest

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Message-ID: <20090327101442.A11521@sedona.ch.intel.com>
Date:	Fri, 27 Mar 2009 10:14:42 +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, oleg@...hat.com,
	juan.villacis@...el.com, ak@...ux.jf.intel.com
Subject: [patch 8/14] x86, ds: fix bounds check in ds selftest

Allow a bts index equal to max. We don't know how the hardware implements
the index wrap-around.


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

Index: git-tip/arch/x86/kernel/ds_selftest.c
===================================================================
--- git-tip.orig/arch/x86/kernel/ds_selftest.c	2009-03-20 14:05:51.000000000 +0100
+++ git-tip/arch/x86/kernel/ds_selftest.c	2009-03-20 14:05:56.000000000 +0100
@@ -47,8 +47,13 @@
 		printk(KERN_CONT "bad bts buffer setup...");
 		error = -1;
 	}
+	/*
+	 * We allow top in [begin; end], since its not clear when the
+	 * overflow adjustment happens: after the increment or before the
+	 * write.
+	 */
 	if ((trace->ds.top < trace->ds.begin) ||
-	    (trace->ds.end <= trace->ds.top)) {
+	    (trace->ds.end < trace->ds.top)) {
 		printk(KERN_CONT "bts top out of bounds...");
 		error = -1;
 	}
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